lavf,lavd: replace av_new_stream->avformat_new_stream part I.

Trivial replacements with sed are done in this commit:
sed 's/av_new_stream(\([^)]*\), 0)/avformat_new_stream(\1, NULL)/'

libavformat/flic.c

@@ -105,7 +105,7 @@ static int flic_read_header(AVFormatContext *s,
         speed = FLIC_DEFAULT_SPEED;
 
     /* initialize the decoder streams */
-    st = av_new_stream(s, 0);
+    st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
     flic->video_stream_index = st->index;