Prevent some buffer overwrite.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-sta...@libav.org
---
 libavcodec/wmaprodec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index 0712fb7..2867b87 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -716,6 +716,7 @@ 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;
-- 
1.8.2.1

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