aacdec: drop channel reseting code.

its no longer needed and causes a race with the flv demuxer.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/aacdec.c

@@ -374,9 +374,6 @@ static void pop_output_configuration(AACContext *ac) {
             ac->oc[1] = ac->oc[0];
             ac->avctx->channels = ac->oc[1].channels;
             ac->avctx->channel_layout = ac->oc[1].channel_layout;
-        }else{
-            ac->avctx->channels = 0;
-            ac->avctx->channel_layout = 0;
         }
     }
 }