evr/mixer: Improve GetService() handling of unsupported interfaces/services.

dlls/evr/mixer.c

@@ -1650,11 +1650,13 @@ static HRESULT WINAPI video_mixer_getservice_GetService(IMFGetService *iface, RE
         {
             return IMFGetService_QueryInterface(iface, riid, obj);
         }
+
+        return E_NOINTERFACE;
     }
 
     FIXME("Unsupported service %s, riid %s.\n", debugstr_guid(service), debugstr_guid(riid));
 
-    return E_NOTIMPL;
+    return MF_E_UNSUPPORTED_SERVICE;
 }
 
 static const IMFGetServiceVtbl video_mixer_getservice_vtbl =

dlls/evr/tests/evr.c

@@ -489,6 +489,10 @@ static void test_default_mixer(void)
     check_service_interface(transform, &MR_VIDEO_MIXER_SERVICE, &IID_IMFVideoProcessor, TRUE);
     check_service_interface(transform, &MR_VIDEO_MIXER_SERVICE, &IID_IMFVideoMixerControl, TRUE);
     check_service_interface(transform, &MR_VIDEO_MIXER_SERVICE, &IID_IMFVideoPositionMapper, TRUE);
+    check_service_interface(transform, &MR_VIDEO_MIXER_SERVICE, &IID_IMFTransform, FALSE);
+
+    hr = MFGetService((IUnknown *)transform, &MR_VIDEO_RENDER_SERVICE, &IID_IUnknown, (void **)&unk);
+    ok(hr == MF_E_UNSUPPORTED_SERVICE, "Unexpected hr %#x.\n", hr);
 
     if (SUCCEEDED(MFGetService((IUnknown *)transform, &MR_VIDEO_MIXER_SERVICE, &IID_IMFVideoMixerControl2, (void **)&mixer_control2)))
     {