avfilter/af_atempo: Make independent of the channel layout

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Pavel Koshevoy <pkoshevoy@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavfilter/af_atempo.c

@@ -1044,9 +1044,8 @@ static int config_props(AVFilterLink *inlink)
 
     enum AVSampleFormat format = inlink->format;
     int sample_rate = (int)inlink->sample_rate;
-    int channels = av_get_channel_layout_nb_channels(inlink->channel_layout);
 
-    return yae_reset(atempo, format, sample_rate, channels);
+    return yae_reset(atempo, format, sample_rate, inlink->channels);
 }
 
 static int push_samples(ATempoContext *atempo,