[XFS] zero log buffer during initialization at mount time

SGI Modid: xfs-linux:xfs-kern:167980a

fs/xfs/xfs_log.c

@@ -1227,7 +1227,7 @@ xlog_alloc_log(xfs_mount_t	*mp,
 			  kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP);
 		iclog = *iclogp;
 		iclog->hic_data = (xlog_in_core_2_t *)
-			  kmem_alloc(iclogsize, KM_SLEEP);
+			  kmem_zalloc(iclogsize, KM_SLEEP);
 
 		iclog->ic_prev = prev_iclog;
 		prev_iclog = iclog;