xfs: shut up -Wuninitialized in xfsaild_push

-Wuninitialized complains about @target in xfsaild_push being
uninitialized in the case where the waitqueue is active but there is no
last item in the AIL to wait for.  I /think/ it should never be the case
that the subsequent xfs_trans_ail_cursor_first returns a log item and
hence we'll never end up at XFS_LSN_CMP, but let's make this explicit.

Signed-off-by: Darrick J. Wong <[email protected]>
Reviewed-by: Gao Xiang <[email protected]>
Reviewed-by: Dave Chinner <[email protected]>

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