check MSCHAPV2 authenticator response

[Andrew]

For the MSChapV2 protocol the Authenticator Response is 42 bit,
according to RFC 2759, Sect. 8.7.

What is the reason, in file  eap_mschapv2.c, eap_ttls.c, only 20 bits
are checked?
in line 
            memcmp(data->auth_response, recv_response, 20) != 0)


Thanks, Andrew

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