go-stun can't support coturn-4.5.0.6

[ccding]

go-stun can't support coturn-4.5.0.6

[ccding]

which line does it fail on?

[lxlenovostar]

 u32bits crc32len = (u32bits)((((const u08bits*)fingerprint)-buf)-4);
    int ret = (*fingerprint == nswap32(ns_crc32(buf,crc32len) ^ ((u32bits)0x5354554e)));
    if(ret && fingerprint_present)
        *fingerprint_present = ret;

[ccding]

I didn't mange to see any incompatibility in this code with the go-stun code. https://github.com/ccding/go-stun/blob/master/stun/attribute.go#L39

Can you do more test to see why the fingerprints can't be verified?

I would appreciate it if you could submit a pull request to fix this.