Revert "winegstreamer: Remove useless check when creating a WMA decoder."

This reverts commit afb2a0c.

This is no longer needed - fixed properly in the backports :-)

Author: ivyl

dlls/winegstreamer/wma_decoder.c

@@ -1033,6 +1033,13 @@ HRESULT wma_decoder_create(IUnknown *outer, IUnknown **out)
 
     TRACE("outer %p, out %p.\n", outer, out);
 
+    if (!(transform = wg_transform_create(&input_format, &output_format)))
+    {
+        ERR_(winediag)("GStreamer doesn't support WMA decoding, please install appropriate plugins\n");
+        return E_FAIL;
+    }
+    wg_transform_destroy(transform);
+
     if (!(decoder = calloc(1, sizeof(*decoder))))
         return E_OUTOFMEMORY;