json & schema_compile BUGFIX uninitialized variables

Fixes #1787
diff --git a/src/schema_compile_node.c b/src/schema_compile_node.c
index 3f61230..e1da522 100644
--- a/src/schema_compile_node.c
+++ b/src/schema_compile_node.c
@@ -2408,7 +2408,8 @@
         struct lysc_node **list;
 
         if (ctx->ext) {
-            lysc_ext_substmt(ctx->ext, LY_STMT_CONTAINER /* matches all data nodes */, (void **)&list, NULL);
+            /* container matches all data nodes */
+            lysc_ext_substmt(ctx->ext, LY_STMT_CONTAINER, (void **)&list, NULL);
         } else if (node->nodetype == LYS_RPC) {
             list = (struct lysc_node **)&ctx->cur_mod->compiled->rpcs;
         } else if (node->nodetype == LYS_NOTIF) {