Merge commit 'ee80f834cbb6dbacdc1efb4c658a7d775e82ebff'

* commit 'ee80f834cbb6dbacdc1efb4c658a7d775e82ebff':
  asfdec: set nb_streams to 0 in the asf_read_close

Merged-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/asfdec_o.c

@@ -1457,6 +1457,7 @@ static int asf_read_close(AVFormatContext *s)
         av_dict_free(&asf->asf_sd[i].asf_met);
     }
 
+    asf->nb_streams = 0;
     return 0;
 }