winegstreamer: Fix reference leaks.

dlls/quartz/tests/filtergraph.c

@@ -366,6 +366,13 @@ static void test_render_run(const WCHAR *file)
     }
 
     releasefiltergraph();
+
+    if (h != INVALID_HANDLE_VALUE) {
+        /* check reference leaks */
+        h = CreateFileW(file, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
+        ok(h != INVALID_HANDLE_VALUE, "CreateFile failed: err=%d\n", GetLastError());
+        CloseHandle(h);
+    }
 }
 
 static void test_graph_builder(void)

dlls/winegstreamer/gstdemux.c

@@ -1951,6 +1951,9 @@ static ULONG WINAPI GSTInPin_Release(IPin *iface)
         if (This->pAlloc)
             IMemAllocator_Release(This->pAlloc);
         This->pAlloc = NULL;
+        if (This->pReader)
+            IAsyncReader_Release(This->pReader);
+        This->pReader = NULL;
         This->pin.IPin_iface.lpVtbl = NULL;
         return 0;
     } else
@@ -2048,6 +2051,7 @@ static HRESULT WINAPI GSTInPin_Disconnect(IPin *iface)
         if (SUCCEEDED(hr) && state == State_Stopped) {
             IMemAllocator_Decommit(This->pAlloc);
             IPin_Disconnect(This->pin.pConnectedTo);
+            IPin_Release(This->pin.pConnectedTo);
             This->pin.pConnectedTo = NULL;
             hr = GST_RemoveOutputPins(Parser);
         } else