Merge branch 'rs/hex-to-bytes-cleanup'

Code cleanup.

* rs/hex-to-bytes-cleanup:
sha1_file: use hex_to_bytes()
http-push: use hex_to_bytes()
notes: move hex_to_bytes() to hex.c and export it

diff --cc cache.h
Simple merge

diff --cc notes.c
Simple merge

diff --cc sha1_file.c
Simple merge