xfs: clean up the end of xfs_attri_item_recover

The end of this function could use some cleanup -- the EAGAIN
conditionals make it harder to figure out what's going on with the
disposal of xattri_leaf_bp, and the dual error/ret variables aren't
needed.  Turn the EAGAIN case into a separate block documenting all the
subtleties of recovering in the middle of an xattr update chain, which
makes the rest of the prologue much simpler.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

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