mfplat: Add a helper to create async result objects.

dlls/mfplat/queue.c

@@ -345,12 +345,10 @@ static const IMFAsyncResultVtbl async_result_vtbl =
     async_result_GetStateNoAddRef,
 };
 
-HRESULT WINAPI MFCreateAsyncResult(IUnknown *object, IMFAsyncCallback *callback, IUnknown *state, IMFAsyncResult **out)
+static HRESULT create_async_result(IUnknown *object, IMFAsyncCallback *callback, IUnknown *state, IMFAsyncResult **out)
 {
     struct async_result *result;
 
-    TRACE("%p, %p, %p, %p.\n", object, callback, state, out);
-
     if (!out)
         return E_INVALIDARG;
 
@@ -374,10 +372,22 @@ HRESULT WINAPI MFCreateAsyncResult(IUnknown *object, IMFAsyncCallback *callback,
 
     *out = &result->result.AsyncResult;
 
+    TRACE("Created async result object %p.\n", *out);
+
     return S_OK;
 }
 
 /***********************************************************************
+ *      MFCreateAsyncResult (mfplat.@)
+ */
+HRESULT WINAPI MFCreateAsyncResult(IUnknown *object, IMFAsyncCallback *callback, IUnknown *state, IMFAsyncResult **out)
+{
+    TRACE("%p, %p, %p, %p.\n", object, callback, state, out);
+
+    return create_async_result(object, callback, state, out);
+}
+
+/***********************************************************************
  *      MFAllocateWorkQueue (mfplat.@)
  */
 HRESULT WINAPI MFAllocateWorkQueue(DWORD *queue)