xfs: fix error returns in CoW fork repair

xfs: fix error returns in CoW fork repair

xrep_cow_find_bad() returns success after the cleanup labels even if
AG setup, btree queries, or bitmap updates failed. This can make
repair continue with an incomplete bad-file-offset bitmap instead of
stopping at the original error.

The force-rebuild path has a related cleanup problem. If
xrep_cow_mark_file_range() fails, the function returns directly and
skips the scrub AG context and perag cleanup.

Let the force-rebuild path fall through to the existing cleanup code
and return the saved error after cleanup.

Fixes: dbbdbd008632 ("xfs: repair problems in CoW forks")
Cc: <stable@vger.kernel.org> # v6.8
Signed-off-by: Yingjie Gao <gaoyingjie@uniontech.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>