gpg: Fix assertion failure due to errors in encrypt_filter.
* common/iobuf.c (iobuf_copy): Use log_assert. Explicitly cast error return value. * g10/build-packet.c (do_plaintext): Check for iobuf_copy error. * g10/encrypt.c (encrypt_filter): Immediately set header_okay.
The second fix avoids repeated error message about non-compliant keys.
Updates-commit: a51067a21f688086bd8e44234a88ae367582cc76
Ported-from: aa0c942521d89f4f0aac90bacaf8a7a7cefc88d8
- GnuPG-bug-id: T6174