ubifs: fix small error path mismatch

In do_readpage(), don't free 'dn' if its allocation failed.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
diff --git a/fs/ubifs/ubifs.c b/fs/ubifs/ubifs.c
index 91fc574..8ede188 100644
--- a/fs/ubifs/ubifs.c
+++ b/fs/ubifs/ubifs.c
@@ -554,10 +554,8 @@
 	}
 
 	dn = kmalloc(UBIFS_MAX_DATA_NODE_SZ, GFP_NOFS);
-	if (!dn) {
-		err = -ENOMEM;
-		goto error;
-	}
+	if (!dn)
+		return -ENOMEM;
 
 	i = 0;
 	while (1) {