avcodec: remove FF_API_THREAD_SAFE_CALLBACKS

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/encode.c

@@ -259,10 +259,9 @@ int ff_encode_encode_cb(AVCodecContext *avctx, AVPacket *avpkt,
 unref:
         av_packet_unref(avpkt);
     }
-#if !FF_API_THREAD_SAFE_CALLBACKS
+
     if (frame)
         av_frame_unref(frame);
-#endif
 
     return ret;
 }
@@ -303,10 +302,6 @@ static int encode_simple_internal(AVCodecContext *avctx, AVPacket *avpkt)
         ret = ff_thread_video_encode_frame(avctx, avpkt, frame, &got_packet);
     else {
         ret = ff_encode_encode_cb(avctx, avpkt, frame, &got_packet);
-#if FF_API_THREAD_SAFE_CALLBACKS
-        if (frame)
-            av_frame_unref(frame);
-#endif
     }
 
     if (avci->draining && !got_packet)