bitpacked: Remove dead store

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

libavcodec/bitpacked.c

@@ -68,10 +68,6 @@ static int bitpacked_decode_yuv422p10(AVCodecContext *avctx, AVFrame *frame,
     if (ret < 0)
         return ret;
 
-    y = (uint16_t*)frame->data[0];
-    u = (uint16_t*)frame->data[1];
-    v = (uint16_t*)frame->data[2];
-
     if (frame_size > packet_size)
         return AVERROR_INVALIDDATA;