Merge commit '6652338f'

* commit '6652338f':
  wmapro: return early on unsupported condition
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/wmaprodec.c

@@ -726,6 +726,7 @@ static int decode_channel_transform(WMAProDecodeCtx* s)
                     if (get_bits1(&s->gb)) {
                         avpriv_request_sample(s->avctx,
                                               "Unknown channel transform type");
+                        return AVERROR_PATCHWELCOME;
                     }
                 } else {
                     chgroup->transform = 1;