hlsenc: When not using HLS_SINGLE_FILE, set vs->size to range_length

This matches what is done in the corresponding case for
HLS_SINGLE_FILE.

Normally, vs->size is already initialized correctly - but when
writing the initial segment, with mp4 files, vs->size has been set
to the size of the init segment, while range_length contains the
real size of the first segment.

Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/hlsenc.c

@@ -2587,6 +2587,7 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
                     av_dict_free(&options);
                     return ret;
                 }
+                vs->size = range_length;
                 ret = hlsenc_io_close(s, &vs->out, filename);
                 if (ret < 0) {
                     av_log(s, AV_LOG_WARNING, "upload segment failed,"