libyang BUGFIX uninitialized variables

reported by coverity
diff --git a/src/parser_xml.c b/src/parser_xml.c
index 2aae751..1c58248 100644
--- a/src/parser_xml.c
+++ b/src/parser_xml.c
@@ -1057,7 +1057,7 @@
 {
     LY_ERR ret = LY_SUCCESS;
     struct lyd_xml_ctx lydctx = {0};
-    struct lyd_node *rpcr_e = NULL, *iter, *req_op, *rep_op;
+    struct lyd_node *rpcr_e = NULL, *iter, *req_op, *rep_op = NULL;
 
     /* init */
     LY_CHECK_GOTO(ret = lyxml_ctx_new(LYD_NODE_CTX(request), data, &lydctx.xmlctx), cleanup);