avfilter/af_aresample: Cleanup on av_channel_layout_copy() failure

Fixes: CID1503078 Resource leak

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 7a0ea15c7a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavfilter/af_aresample.c

@@ -195,8 +195,11 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamplesref)
     av_frame_copy_props(outsamplesref, insamplesref);
     outsamplesref->format                = outlink->format;
     ret = av_channel_layout_copy(&outsamplesref->ch_layout, &outlink->ch_layout);
-    if (ret < 0)
+    if (ret < 0) {
+        av_frame_free(&outsamplesref);
+        av_frame_free(&insamplesref);
         return ret;
+    }
     outsamplesref->sample_rate           = outlink->sample_rate;
 
     if(insamplesref->pts != AV_NOPTS_VALUE) {