avformat/tee: clean up local resources on program copy failure

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>

libavformat/tee.c

@@ -298,7 +298,7 @@ static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
         ret = av_program_copy(avf2, (const AVFormatContext *)avf, avf->programs[i]->id, 0);
         if (ret < 0) {
             av_log(avf, AV_LOG_ERROR, "unable to transfer program %d to child muxer\n", avf->programs[i]->id);
-            return ret;
+            goto end;
         }
     }