bfd_check_format_matches preserving matches vs. cleanups

It didn't take long for oss-fuzz to find double frees due to a bug in
the cleanup logic.  It's seen when reading in any alpha-vms object
file except when alpha_vms_vec is the default.  But alpha_vms_vec is
of course the default when building for --target=alpha-dec-vms (and
naturally what I used to  test the cleanup support since that is the
only target with a cleanup that does anything currently).

Anyway, the bug is that if bfd_check_format_matches is to preserve a
match the cleanup for that match can't be run.  Quite obviously that
would destroy part of the match state.

	* format.c (struct bfd_preserve): Add cleanup field.
	(bfd_preserve_save): Add cleanup param and save.
	(bfd_preserve_restore): Return cleanup.
	(bfd_preserve_finish): Call the cleanup for the discarded match.
	(bfd_check_format_matches): Pass cleanup to bfd_preserve_save,
	and clear when preserving a match.  Restore cleanup too when
	restoring that match.

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