xfs: mark xfs_buf_ioend static

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/xfs_buf.c

@@ -1174,7 +1174,7 @@ xfs_buf_wait_unpin(
  *	Buffer Utility Routines
  */
 
-void
+static void
 xfs_buf_ioend(
 	struct xfs_buf	*bp)
 {