add onnx model parse api

parser/onnx/onnx_parser.cc

@@ -630,11 +630,12 @@ Status OnnxModelParser::Parse(const char *file, ge::Graph &graph) {
     GELOGE(FAILED, "get model from file failed.");
     return FAILED;
   }
-  ret = RealParse(onnx_model, graph)
+  ret = RealParse(onnx_model, graph);
   if (ret != SUCCESS) {
     GELOGE(FAILED, "parse model failed.");
     return FAILED;
   }
+  return SUCCESS;
 }
 
 Status OnnxModelParser::ParseFromMemory(const char *data, uint32_t size, ge::Graph &graph) {
@@ -649,6 +650,7 @@ Status OnnxModelParser::ParseFromMemory(const char *data, uint32_t size, ge::Gra
     GELOGE(FAILED, "parse model failed.");
     return FAILED;
   }
+  return SUCCESS;
 }
 
 Status OnnxModelParser::ToJson(const char *model_file, const char *json_file) {