Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/md/persistent-data/dm-space-map-common.c b/drivers/md/persistent-data/dm-space-map-common.c
index 0a3b8ae..bd68f6f 100644
--- a/drivers/md/persistent-data/dm-space-map-common.c
+++ b/drivers/md/persistent-data/dm-space-map-common.c
@@ -190,6 +190,8 @@
 
 static int sm_ll_init(struct ll_disk *ll, struct dm_transaction_manager *tm)
 {
+	memset(ll, 0, sizeof(struct ll_disk));
+
 	ll->tm = tm;
 
 	ll->bitmap_info.tm = tm;
@@ -367,10 +369,6 @@
 			 */
 			dm_tm_unlock(ll->tm, blk);
 			continue;
-
-		} else if (r < 0) {
-			dm_tm_unlock(ll->tm, blk);
-			return r;
 		}
 
 		dm_tm_unlock(ll->tm, blk);