Remove additional reference

Clippy emits:

  warning: this expression creates a reference which is immediately
  dereferenced by the compiler

As suggested, remove the additional reference.

src/blockdata/script.rs

@@ -469,9 +469,9 @@ impl Script {
     /// the current script, assuming that the script is a Tapscript.
     #[inline]
     pub fn to_v1_p2tr<C: Verification>(&self, secp: &Secp256k1<C>, internal_key: UntweakedPublicKey) -> Script {
-        let leaf_hash = TapLeafHash::from_script(&self, LeafVersion::TapScript);
+        let leaf_hash = TapLeafHash::from_script(self, LeafVersion::TapScript);
         let merkle_root = TapBranchHash::from_inner(leaf_hash.into_inner());
-        Script::new_v1_p2tr(&secp, internal_key, Some(merkle_root))
+        Script::new_v1_p2tr(secp, internal_key, Some(merkle_root))
     }
 
     /// Returns witness version of the script, if any, assuming the script is a `scriptPubkey`.

src/blockdata/witness.rs

@@ -218,7 +218,7 @@ impl Witness {
     pub fn push_bitcoin_signature(&mut self, signature: &ecdsa::SerializedSignature, hash_type: EcdsaSighashType) {
         // Note that a maximal length ECDSA signature is 72 bytes, plus the sighash type makes 73
         let mut sig = [0; 73];
-        sig[..signature.len()].copy_from_slice(&signature);
+        sig[..signature.len()].copy_from_slice(signature);
         sig[signature.len()] = hash_type as u8;
         self.push(&sig[..signature.len() + 1]);
     }

src/util/psbt/serialize.rs

@@ -125,7 +125,7 @@ impl Deserialize for EcdsaSig {
         // also has a field sighash_u32 (See BIP141). For example, when signing with non-standard
         // 0x05, the sighash message would have the last field as 0x05u32 while, the verification
         // would use check the signature assuming sighash_u32 as `0x01`.
-        EcdsaSig::from_slice(&bytes)
+        EcdsaSig::from_slice(bytes)
             .map_err(|e| match e {
                 EcdsaSigError::EmptySignature => {
                     encode::Error::ParseFailed("Empty partial signature data")
@@ -145,7 +145,7 @@ impl Deserialize for EcdsaSig {
 
 impl Serialize for KeySource {
     fn serialize(&self) -> Vec<u8> {
-        let mut rv: Vec<u8> = Vec::with_capacity(key_source_len(&self));
+        let mut rv: Vec<u8> = Vec::with_capacity(key_source_len(self));
 
         rv.append(&mut self.0.to_bytes().to_vec());
 
@@ -207,7 +207,7 @@ impl Deserialize for PsbtSighashType {
 // Taproot related ser/deser
 impl Serialize for XOnlyPublicKey {
     fn serialize(&self) -> Vec<u8> {
-        XOnlyPublicKey::serialize(&self).to_vec()
+        XOnlyPublicKey::serialize(self).to_vec()
     }
 }
 
@@ -226,7 +226,7 @@ impl Serialize for schnorr::SchnorrSig  {
 
 impl Deserialize for schnorr::SchnorrSig {
     fn deserialize(bytes: &[u8]) -> Result<Self, encode::Error> {
-        schnorr::SchnorrSig::from_slice(&bytes)
+        schnorr::SchnorrSig::from_slice(bytes)
             .map_err(|e| match e {
                 schnorr::SchnorrSigError::InvalidSighashType(flag) => {
                     encode::Error::from(psbt::Error::NonStandardSighashType(flag as u32))
@@ -264,7 +264,7 @@ impl Deserialize for (XOnlyPublicKey, TapLeafHash) {
 
 impl Serialize for ControlBlock {
     fn serialize(&self) -> Vec<u8> {
-        ControlBlock::serialize(&self)
+        ControlBlock::serialize(self)
     }
 }
 
@@ -311,7 +311,7 @@ impl Serialize for (Vec<TapLeafHash>, KeySource) {
 
 impl Deserialize for (Vec<TapLeafHash>, KeySource) {
     fn deserialize(bytes: &[u8]) -> Result<Self, encode::Error> {
-        let (leafhash_vec, consumed) = deserialize_partial::<Vec<TapLeafHash>>(&bytes)?;
+        let (leafhash_vec, consumed) = deserialize_partial::<Vec<TapLeafHash>>(bytes)?;
         let key_source = KeySource::deserialize(&bytes[consumed..])?;
         Ok((leafhash_vec, key_source))
     }

src/util/schnorr.rs

@@ -110,9 +110,9 @@ impl TapTweak for UntweakedPublicKey {
     fn tap_tweak<C: Verification>(self, secp: &Secp256k1<C>, merkle_root: Option<TapBranchHash>) -> (TweakedPublicKey, secp256k1::Parity) {
         let tweak_value = TapTweakHash::from_key_and_tweak(self, merkle_root).into_inner();
         let mut output_key = self.clone();
-        let parity = output_key.tweak_add_assign(&secp, &tweak_value).expect("Tap tweak failed");
+        let parity = output_key.tweak_add_assign(secp, &tweak_value).expect("Tap tweak failed");
 
-        debug_assert!(self.tweak_add_check(&secp, &output_key, parity, tweak_value));
+        debug_assert!(self.tweak_add_check(secp, &output_key, parity, tweak_value));
         (TweakedPublicKey(output_key), parity)
     }
 
@@ -140,7 +140,7 @@ impl TapTweak for UntweakedKeyPair {
     fn tap_tweak<C: Verification>(mut self, secp: &Secp256k1<C>, merkle_root: Option<TapBranchHash>) -> TweakedKeyPair {
         let pubkey = crate::XOnlyPublicKey::from_keypair(&self);
         let tweak_value = TapTweakHash::from_key_and_tweak(pubkey, merkle_root).into_inner();
-        self.tweak_add_assign(&secp, &tweak_value).expect("Tap tweak failed");
+        self.tweak_add_assign(secp, &tweak_value).expect("Tap tweak failed");
         TweakedKeyPair(self)
     }
 

src/util/taproot.rs

@@ -802,7 +802,7 @@ impl ControlBlock {
     ) -> bool {
         // compute the script hash
         // Initially the curr_hash is the leaf hash
-        let leaf_hash = TapLeafHash::from_script(&script, self.leaf_version);
+        let leaf_hash = TapLeafHash::from_script(script, self.leaf_version);
         let mut curr_hash = TapBranchHash::from_inner(leaf_hash.into_inner());
         // Verify the proof
         for elem in self.merkle_branch.as_inner() {