gpg: Graceful exit for signature checking with --batch.
* g10/mainproc.c (check_sig_and_print): Don't abort computation in the function, but returns an error. (proc_tree): Break the loop, when check_sig_and_print returns an error.
- GnuPG-bug-id: T6512
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>