ubifs: Fix cut and paste error on sb type comparisons

The check for the bad node type of sb->type is checking sa->type
and not sb-type. This looks like a cut and paste error. Fix this.

Detected by PVS-Studio, warning: V581

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/ubifs/debug.c

@@ -2391,8 +2391,8 @@ int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head)
 			ubifs_dump_node(c, sa->node);
 			return -EINVAL;
 		}
-		if (sa->type != UBIFS_INO_NODE && sa->type != UBIFS_DENT_NODE &&
-		    sa->type != UBIFS_XENT_NODE) {
+		if (sb->type != UBIFS_INO_NODE && sb->type != UBIFS_DENT_NODE &&
+		    sb->type != UBIFS_XENT_NODE) {
 			ubifs_err(c, "bad node type %d", sb->type);
 			ubifs_dump_node(c, sb->node);
 			return -EINVAL;