22769268f3 units: Close the hex parse errors (Tobin C. Harding)
Pull request description:
As part of the 1.0 effort close the errors in the `units::parse` module.
ACKs for top commit:
apoelstra:
ACK 22769268f34b45c0bd86c548eb13cfe1e290f0d7; successfully ran local tests; thanks!
sanket1729:
ACK 22769268f3
Tree-SHA512: 598ba236f8c08c3f750112e0d8b8e0aa0568be2700a328e4a2d8999ca59eada8a16a6a1d9e9121e7f42ce9bbe3da3f87221ba67c36056996a687e489f4c6007c