parser BUGFIX skip new validation on multi-error

Because it could cause auto-deletion, which in turn
invalid memory access.
diff --git a/src/parser_xml.c b/src/parser_xml.c
index 93d2e84..3ea3684 100644
--- a/src/parser_xml.c
+++ b/src/parser_xml.c
@@ -845,8 +845,8 @@
         LY_CHECK_ERR_GOTO(r, rc = r, cleanup);
     }
 
-    if (!(lydctx->parse_opts & LYD_PARSE_ONLY)) {
-        /* new node validation, autodelete CANNOT occur, all nodes are new */
+    if (!(lydctx->parse_opts & LYD_PARSE_ONLY) && !rc) {
+        /* new node validation, autodelete CANNOT occur (it can if multi-error), all nodes are new */
         r = lyd_validate_new(lyd_node_child_p(*node), snode, NULL, lydctx->val_opts, NULL);
         LY_DPARSER_ERR_GOTO(r, rc = r, lydctx, cleanup);