Replace remaining occurances of av_free_packet with av_packet_unref

libavformat/redspark.c

@@ -148,7 +148,7 @@ static int redspark_read_packet(AVFormatContext *s, AVPacket *pkt)
 
     ret = av_get_packet(s->pb, pkt, size);
     if (ret != size) {
-        av_free_packet(pkt);
+        av_packet_unref(pkt);
         return AVERROR(EIO);
     }