xfs: fix reloading the last iunlink item

It's not a good idea to be trying to send bug fixes to the mailing list
while also trying to take a vacation.  Dave sent some review comments
about the iunlink reloading patches, I changed them in djwong-dev, and
forgot to backport those changes to my -fixes tree.

As a result, the patch is missing some important pieces.  Perhaps
manually copying code diffs between email and two separate git trees
is archaic and stupid^W^W^W^Wisn't really a good idea?

This has been lightly tested with fstests.  Enjoy!

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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