gpg: Sanitize diagnostic with the original file name.
* g10/mainproc.c (proc_plaintext): Sanitize verbose output.
This fixes a forgotten sanitation of user supplied data in a verbose
mode diagnostic. The mention CVE is about using this to inject
status-fd lines into the stderr output. Other harm good as well be
done. Note that GPGME based applications are not affected because
GPGME does not fold status output into stderr.
(cherry picked from commit 13f135c7a252cc46cff96e75968d92b6dc8dce1b)
- GnuPG-bug-id: T4012