Changed Base32hex/64 return data type to int32_t

src/common/base32hex.c

src/common/base32hex.h

src/common/base64.c

src/common/base64.h

src/knot/zone/semantic-check.c

src/knot/zone/zone-dump-text.c

src/libknot/tsig-op.c

src/libknot/zone/zone-contents.c

src/zcompile/parser-util.c