common: Avoid warnings about useless assignments.
* common/b64enc.c (b64enc_finish): Remove var assignment which is not used later. * common/iobuf.c (file_filter): Ditto. * common/tlv.c (do_find_tlv): Ditto. * common/userids.c (classify_user_id): Ditto.
- Signed-off-by: Werner Koch <wk@gnupg.org>