mshtml: Use do_query_service in QueryService implementation.

dlls/mshtml/service.c

@@ -252,18 +252,11 @@ static HRESULT WINAPI ServiceProvider_QueryService(IServiceProvider *iface, REFG
     TRACE("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
 
     if(This->doc_obj->client) {
-        IServiceProvider *sp;
         HRESULT hres;
 
-        hres = IOleClientSite_QueryInterface(This->doc_obj->client,
-                &IID_IServiceProvider, (void**)&sp);
-        if(SUCCEEDED(hres)) {
-            hres = IServiceProvider_QueryService(sp, guidService, riid, ppv);
-            IServiceProvider_Release(sp);
-
-            if(SUCCEEDED(hres))
-                return hres;
-        }
+        hres = do_query_service((IUnknown*)This->doc_obj->client, guidService, riid, ppv);
+        if(SUCCEEDED(hres))
+            return hres;
     }
 
     FIXME("unknown service %s\n", debugstr_guid(guidService));