[XFS] No need to initialise struct xfs_trans field to null after a zalloc.

SGI Modid: 2.5.x-xfs:slinx:163115a

fs/xfs/xfs_trans.c

@@ -142,9 +142,9 @@ _xfs_trans_alloc(
 	uint		type)
 {
 	xfs_trans_t	*tp;
+
 	ASSERT(xfs_trans_zone != NULL);
 	tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
-	tp->t_dqinfo = NULL;
 
 	/*
 	 * Initialize the transaction structure.