* progress.c (handle_progress): Store a copy of NAME.
(progress_filter): Release WHAT, make sure not to print a NULL WHAT.
* openfile.c (open_sigfile): Adjust free for new progress semantics.
* plaintext.c (ask_for_detached_datafile): Don't dealloc pfx->WHAT.
duplicate signatures with --expert.
* pkclist.c (check_signatures_trust): Don't display a null fingerprint
when checking a signature with --always-trust enabled.
* filter.h (progress_filter_context_t), progress.c (handle_progress): Fix
compiler warnings. Make "what" constant.
* build-packet.c (do_plaintext): Do not create invalid literal packets
with >255-byte names.
