sapenc: Free AVStream->info on cleanup

This fixes yet another memory leak, present since SVN rev 25418.

Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit 1f56f5ed6d)

libavformat/sapenc.c

@@ -48,6 +48,7 @@ static int sap_write_close(AVFormatContext *s)
         url_fclose(rtpctx->pb);
         av_metadata_free(&rtpctx->streams[0]->metadata);
         av_metadata_free(&rtpctx->metadata);
+        av_free(rtpctx->streams[0]->info);
         av_free(rtpctx->streams[0]);
         av_free(rtpctx);
         s->streams[i]->priv_data = NULL;