simplify stristart()
Originally committed as revision 9393 to svn://svn.ffmpeg.org/ffmpeg/trunk
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				@ -44,23 +44,15 @@ int strstart(const char *str, const char *pfx, const char **ptr)
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 * prefix.
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 *
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 * @param str input string
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 * @param val prefix to test
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 * @param pfx prefix to test
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 * @param ptr updated after the prefix in str in there is a match
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 * @return TRUE if there is a match */
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int stristart(const char *str, const char *val, const char **ptr)
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int stristart(const char *str, const char *pfx, const char **ptr)
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{
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    const char *p, *q;
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    p = str;
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    q = val;
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    while (*q != '\0') {
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        if (toupper(*(const unsigned char *)p) != toupper(*(const unsigned char *)q))
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            return 0;
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        p++;
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        q++;
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    }
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    if (ptr)
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        *ptr = p;
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    return 1;
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    while (*pfx && toupper((unsigned)*pfx++) == toupper((unsigned)*str++));
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    if (!*pfx && ptr)
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        *ptr = str;
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    return !*pfx;
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}
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/**
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