Remove redundant clone

Clippy emits:

  warning: redundant clone

Remove the redundant calls to clone.

src/blockdata/transaction.rs

@@ -1092,7 +1092,7 @@ mod tests {
         let expected_strippedsize = (EXPECTED_WEIGHT - tx_bytes.len()) / (WITNESS_SCALE_FACTOR - 1);
         assert_eq!(realtx.strippedsize(), expected_strippedsize);
         // Construct a transaction without the witness data.
-        let mut tx_without_witness = realtx.clone();
+        let mut tx_without_witness = realtx;
         tx_without_witness.input.iter_mut().for_each(|input| input.witness.clear());
         assert_eq!(tx_without_witness.weight(), expected_strippedsize*WITNESS_SCALE_FACTOR);
         assert_eq!(tx_without_witness.size(), expected_strippedsize);

src/util/bip158.rs

@@ -651,7 +651,7 @@ mod test {
                 query.push(p.clone());
             }
             query.push(Vec::from_hex("abcdef").unwrap());
-            let mut input = Cursor::new(bytes.clone());
+            let mut input = Cursor::new(bytes);
             assert!(!reader.match_all(&mut input, &mut query.iter().map(|v| v.as_slice())).unwrap());
         }
     }

src/util/psbt/serialize.rs

@@ -393,7 +393,7 @@ mod tests {
         let mut builder = compose_taproot_builder(0x51, &[2, 2, 2]);
         builder = builder.add_leaf_with_ver(3, Script::from_hex("b9").unwrap(), LeafVersion::from_consensus(0xC2).unwrap()).unwrap();
         builder = builder.add_hidden_node(3, sha256::Hash::default()).unwrap();
-        assert!(TapTree::from_builder(builder.clone()).is_err());
+        assert!(TapTree::from_builder(builder).is_err());
     }
 
     #[test]