lavc/videotoolboxenc: make transfer_fnc initialized for unsupport function

The current function will report one error message, but the caller func
haven't check it, so change the default to process as AVCOL_TRC_UNSPECIFIED.

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
Signed-off-by: Rick Kern <kernrj@gmail.com>

diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
index ece9d6ea8fba91b533fe638330a011ca5d8880f1..d76bb7f64698810b80562487882493618830c94c 100644 (file)
--- a/libavcodec/videotoolboxenc.c
+++ b/libavcodec/videotoolboxenc.c
@@ -949,6 +949,7 @@ static int get_cv_transfer_function(AVCodecContext *avctx,
             break;
 
         default:
+            *transfer_fnc = NULL;
             av_log(avctx, AV_LOG_ERROR, "Transfer function %s is not supported.\n", av_color_transfer_name(trc));
             return -1;
     }