avfilter/vf_mix: Free inpads' names generically

Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavfilter/vf_mix.c

@@ -125,10 +125,8 @@ static av_cold int init(AVFilterContext *ctx)
             if (!pad.name)
                 return AVERROR(ENOMEM);
 
-            if ((ret = ff_append_inpad(ctx, &pad)) < 0) {
-                av_freep(&pad.name);
+            if ((ret = ff_append_inpad_free_name(ctx, &pad)) < 0)
                 return ret;
-            }
         }
     }
 
@@ -304,10 +302,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     ff_framesync_uninit(&s->fs);
     av_freep(&s->weights);
 
-    if (!s->tmix) {
-        for (i = 0; i < ctx->nb_inputs; i++)
-            av_freep(&ctx->input_pads[i].name);
-    } else {
+    if (s->tmix) {
         for (i = 0; i < s->nb_frames && s->frames; i++)
             av_frame_free(&s->frames[i]);
     }