Removed a debug commit in ffmpeg (do not force display of every frame).

(cherry picked from commit 8a501247)
Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

modules/codec/avcodec/video.c

@@ -552,8 +552,6 @@ picture_t *DecodeVideo( decoder_t *p_dec, block_t **pp_block )
         p_sys->i_buffer -= i_used;
         p_sys->p_buffer += i_used;
 
-    p_sys->b_first_frame = true;
-
         /* Nothing to display */
         if( !b_gotpicture )
         {