avformat/tee: Fix TeeSlave.bsfs pointer array size

TeeSlave.bsfs is array of pointers to AVBitStreamFilterContext,
so element size should be really size of a pointer, not size
of TeeSlave structure.
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Jan Sebechlebsky <sebechlebskyjan@gmail.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

libavformat/tee.c

@@ -324,7 +324,7 @@ static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
     }
     tee_slave->header_written = 1;
 
-    tee_slave->bsfs = av_calloc(avf2->nb_streams, sizeof(TeeSlave));
+    tee_slave->bsfs = av_calloc(avf2->nb_streams, sizeof(*tee_slave->bsfs));
     if (!tee_slave->bsfs) {
         ret = AVERROR(ENOMEM);
         goto end;