avfilter/asubprocess: fix leak in write_frame

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

libavfilter/af_asubprocess.c

@@ -585,6 +585,11 @@ static int write_frame(AVFilterContext *ctx, ASubProcessContext *s, AVFilterLink
 
     s->nb_input_samples += in->nb_samples;
     ret = write_samples(ctx, s, (int32_t *)in->data[0], in->nb_samples * inlink->ch_layout.nb_channels);
+    if (ret < 0) {
+        av_frame_free(&in);
+        return ret;
+    }
+
     if (av_frame_is_writable(in)) {
         out = in;
     } else {
@@ -593,8 +598,13 @@ static int write_frame(AVFilterContext *ctx, ASubProcessContext *s, AVFilterLink
             av_frame_free(&in);
             return AVERROR(ENOMEM);
         }
-        av_frame_copy_props(out, in);
-        // TODO: LEAK
+        ret = av_frame_copy_props(out, in);
+        if (ret < 0) {
+            av_frame_free(&in);
+            av_frame_free(&out);
+            return ret;
+        }
+        av_frame_free(&in);
     }
     ff_framequeue_add(&s->frame_queue, out);
     return ret;