Merge commit '5c8a5765'

* commit '5c8a5765':
  scale_npp: explicitly set the output frames context for passthrough mode

See 62b75537Merged-by: James Almer <jamrial@gmail.com>

libavfilter/vf_scale_npp.c

@@ -319,10 +319,10 @@ static int init_processing_chain(AVFilterContext *ctx, int in_width, int in_heig
         last_stage = i;
     }
 
-    if (last_stage < 0)
-        ctx->outputs[0]->hw_frames_ctx = av_buffer_ref(ctx->inputs[0]->hw_frames_ctx);
-    else
+    if (last_stage >= 0)
         ctx->outputs[0]->hw_frames_ctx = av_buffer_ref(s->stages[last_stage].frames_ctx);
+    else
+        ctx->outputs[0]->hw_frames_ctx = av_buffer_ref(ctx->inputs[0]->hw_frames_ctx);
 
     if (!ctx->outputs[0]->hw_frames_ctx)
         return AVERROR(ENOMEM);