fix vclear

src/varray.c

@@ -65,25 +65,24 @@ int vput(var v, int idx, void* data)
     return method(obj, idx, data);
 }
 
-void vclear(var v)
+int vclear(var v, int idx)
 {
     meta_obj_t* obj    = NULL;
     vclear_fn_t method = NULL;
 
+    if (idx < 0) {
+        return -EINVAL;
+    }
+
     obj = RTTI_DATA_TO_OBJ(v);
     if (RTTI_OBJ_INVALID(obj)) {
-        errno = EINVAL;
-        return;
+        return -EINVAL;
     }
 
     RTTI_GET_METHOD(method, obj, varray, vclear);
     if (method == NULL) {
-        errno = EINVAL;
-
-        return;
+        return -EINVAL;
     }
 
-    method(obj);
-
-    return;
+    return method(obj, idx);
 }