winegstreamer: Release the IAsyncReader on disconnection.

dlls/qedit/tests/mediadet.c

@@ -1147,9 +1147,9 @@ START_TEST(mediadet)
     test_COM_sg_enumpins();
 
     ret = DeleteFileW(test_avi_filename);
-    todo_wine ok(ret, "Failed to delete file, error %u.\n", GetLastError());
+    ok(ret, "Failed to delete file, error %u.\n", GetLastError());
     ret = DeleteFileW(test_sound_avi_filename);
-    todo_wine ok(ret, "Failed to delete file, error %u.\n", GetLastError());
+    ok(ret, "Failed to delete file, error %u.\n", GetLastError());
 
     CoUninitialize();
 }

dlls/winegstreamer/gstdemux.c

@@ -1598,6 +1598,9 @@ static void gstdemux_sink_disconnect(struct strmbase_sink *iface)
     mark_wine_thread();
 
     GST_RemoveOutputPins(filter);
+
+    IAsyncReader_Release(filter->reader);
+    filter->reader = NULL;
 }
 
 static const struct strmbase_sink_ops sink_ops =