xfs: remove the unused xfs_buf_delwri_sort function

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

fs/xfs/linux-2.6/xfs_buf.c

@@ -1721,14 +1721,6 @@ xfs_buf_cmp(
 	return 0;
 }
 
-void
-xfs_buf_delwri_sort(
-	xfs_buftarg_t	*target,
-	struct list_head *list)
-{
-	list_sort(NULL, list, xfs_buf_cmp);
-}
-
 STATIC int
 xfsbufd(
 	void		*data)