avfilter/af_compand: some more cosmetics to decrease difference with qatar

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/af_compand.c

@@ -287,8 +287,8 @@ static int compand_drain(AVFilterLink *outlink)
     AVFilterContext *ctx = outlink->src;
     CompandContext *s    = ctx->priv;
     const int channels   = outlink->channels;
-    int chan, i, dindex;
     AVFrame *frame       = NULL;
+    int chan, i, dindex;
 
     /* 2048 is to limit output frame size during drain */
     frame = ff_get_audio_buffer(outlink, FFMIN(2048, s->delay_count));