xfs_repair: don't guess about failure reason in phase6

xfs_repair: don't guess about failure reason in phase6

There are many error messages in phase 6 which say
"filesystem may be out of space," when in reality the failure could
have been corruption or some other issue.  Rather than guessing, and
emitting a confusing and possibly-wrong message, use the existing
res_failed() for any xfs_trans_alloc failures, and simply print the
error number in the other cases.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>