avfilter/vf_pad: use already available outlink variable

libavfilter/vf_pad.c

@@ -355,7 +355,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 
     if (needs_copy) {
         av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
-        out = ff_get_video_buffer(inlink->dst->outputs[0],
+        out = ff_get_video_buffer(outlink,
                                   FFMAX(inlink->w, s->w),
                                   FFMAX(inlink->h, s->h));
         if (!out) {
@@ -410,7 +410,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 
     if (in != out)
         av_frame_free(&in);
-    return ff_filter_frame(inlink->dst->outputs[0], out);
+    return ff_filter_frame(outlink, out);
 }
 
 #define OFFSET(x) offsetof(PadContext, x)