cfhd: Do not initialize context size

Otherwise probing and stream analisys will report a correct coded size
but an empty visible size.

Approved by: kieran
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/cfhd.c

@@ -43,8 +43,6 @@ static av_cold int cfhd_decode_init(AVCodecContext *avctx)
 
     avctx->bits_per_raw_sample = 10;
     s->avctx                   = avctx;
-    avctx->width               = 0;
-    avctx->height              = 0;
 
     return ff_cfhd_init_vlcs(s);
 }