lavc/pthread: use THREAD_SAFE_CALLBACKS() to simplifx more code

use THREAD_SAFE_CALLBACKS() to simplifx more code
Signed-off-by: Jun Zhao <mypopydev@gmail.com>

libavcodec/pthread_frame.c

@@ -908,8 +908,7 @@ static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int
     }
 
     pthread_mutex_lock(&p->parent->buffer_mutex);
-    if (avctx->thread_safe_callbacks ||
-        avctx->get_buffer2 == avcodec_default_get_buffer2) {
+    if (THREAD_SAFE_CALLBACKS(avctx)) {
         err = ff_get_buffer(avctx, f->f, flags);
     } else {
         pthread_mutex_lock(&p->progress_mutex);
@@ -976,8 +975,7 @@ void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
     FrameThreadContext *fctx;
     AVFrame *dst, *tmp;
     int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
-                          avctx->thread_safe_callbacks                   ||
-                          avctx->get_buffer2 == avcodec_default_get_buffer2;
+                          THREAD_SAFE_CALLBACKS(avctx);
 
     if (!f->f || !f->f->buf[0])
         return;