avformat/srtdec: make sure we probe a number
Fixes regression since 7218352e0228028dfa009a3799ec93fd041065f1: WebVTT files were matching the SRT probing.
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				@ -45,7 +45,7 @@ static int srt_probe(AVProbeData *p)
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     * Also, that number can be followed by random garbage, so we can not
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					     * Also, that number can be followed by random garbage, so we can not
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     * unfortunately check that we only have a number. */
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					     * unfortunately check that we only have a number. */
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    if (ff_subtitles_read_line(&tr, buf, sizeof(buf)) < 0 ||
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					    if (ff_subtitles_read_line(&tr, buf, sizeof(buf)) < 0 ||
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        strtol(buf, &pbuf, 10) < 0)
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					        strtol(buf, &pbuf, 10) < 0 || pbuf == buf)
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        return 0;
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					        return 0;
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    /* Check if the next line matches a SRT timestamp */
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					    /* Check if the next line matches a SRT timestamp */
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