gpg: Fix armor parsing when no CRC is found.
* g10/armor.c (radix64_read): Fix no CRC at the end of armor.
Cherry pick master commit of:
b7aa3f5e320dff0d35ce90c6f6381ee4213b6eb7
- Fixes-commit: 62b8bf2f390533d23e24d27552fecf562752d358
- GnuPG-bug-id: T7071
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>