libavformat/hlsenc: fix a memory leak on error path

Signed-off-by: LuMingYin <lumingyindetect@163.com>
Reviewed-by: Steven Liu <lq@chinaffmpeg.org>
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>

libavformat/hlsenc.c

@@ -2757,6 +2757,7 @@ static int hls_write_trailer(struct AVFormatContext *s)
             filename = av_asprintf("%s", oc->url);
         }
         if (!filename) {
+            av_dict_free(&options);
             av_freep(&old_filename);
             return AVERROR(ENOMEM);
         }