* bfd.c (enum bfd_error): Add bfd_error_wrong_object_format.

	* bfd.c (enum bfd_error): Add bfd_error_wrong_object_format.
	(bfd_errmsgs): Add corresponding message.
	* archive.c (bfd_generic_archive_p): Don't release bfd_ardata when
	finding an archive that contains different format object files.
	Return bfd_error_wrong_object_format for this case.
	* format.c: Formatting fixes.  s/CONST/const/.
	(bfd_check_format_matches): Accept archives that give
	bfd_error_wrong_object_format if no full match is found.  Tidy
	code handling matching_vector.  Don't return a pointer to freed
	memory in `matching'.  Handle ambiguous matches as for partial
	archive matches.
	* bfd-in2.h: Regenerate.