ffv1dec: remove redundant error message.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/ffv1dec.c

@@ -762,10 +762,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPac
         p->key_frame = 0;
     }
 
-    if ((ret = ff_thread_get_buffer(avctx, &frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "ff_thread_get_buffer() failed.\n");
+    if ((ret = ff_thread_get_buffer(avctx, &frame, AV_GET_BUFFER_FLAG_REF)) < 0)
         return ret;
-    }
 
     if (avctx->debug & FF_DEBUG_PICT_INFO)
         av_log(avctx, AV_LOG_DEBUG, "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",