src: fix possible dereference of null pointer · nodejs/node@11e4cd6

Original file line number	Diff line number	Diff line change
`@@ -704,9 +704,9 @@ void napi_module_register_by_symbol(v8::Local<v8::Object> exports,`
`704`	`704`	`napi_addon_register_func init,`
`705`	`705`	`int32_t module_api_version) {`
`706`	`706`	`node::Environment* node_env = node::Environment::GetCurrent(context);`
	`707`	`+CHECK_NOT_NULL(node_env);`
`707`	`708`	`std::string module_filename = "";`
`708`	`709`	`if (init == nullptr) {`
`709`		`-CHECK_NOT_NULL(node_env);`
`710`	`710`	`node_env->ThrowError("Module has no declared entry point.");`
`711`	`711`	`return;`
`712`	`712`	`}`