lavc/pthread_frame: Update user context in ff_frame_thread_free

Resolution/format changes lead to re-initialization of hardware
accelerations(vaapi/dxva2/..) with new hwaccel_priv_data in
the worker-thread. But hwaccel_priv_data in user context won't
be updated until the resolution changing frame is output.

A termination with "-vframes" just after the reinit will lead to:
    1. memory leak in worker-thread.
    2. double free in user-thread.

Update user context in ff_frame_thread_free with the last thread
submit_packet() was called on.

To reproduce:
ffmpeg -hwaccel vaapi(dxva2) -v verbose -i
    fate-suite/h264/reinit-large_420_8-to-small_420_8.h264 -pix_fmt nv12
    -f rawvideo -vsync passthrough -vframes 47 -y out.yuv

Signed-off-by: Linjie Fu <linjie.fu@intel.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/pthread_frame.c

@@ -658,6 +658,13 @@ void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
 
     park_frame_worker_threads(fctx, thread_count);
 
+    if (fctx->prev_thread && avctx->internal->hwaccel_priv_data !=
+                             fctx->prev_thread->avctx->internal->hwaccel_priv_data) {
+        if (update_context_from_thread(avctx, fctx->prev_thread->avctx, 1) < 0) {
+            av_log(avctx, AV_LOG_ERROR, "Failed to update user thread.\n");
+        }
+    }
+
     if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
         if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
             av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");