fido_init() not being called

[Brian Candler]

Hello, just raising a minor issue in sk-usbhid.c

At the moment, fido_init() is not being called except when SK_DEBUG is 
enabled (which normally isn't):

#ifdef SK_DEBUG
         fido_init(FIDO_DEBUG);
#endif

That exists in two places.  I mentioned this in passing on the libfido2 
tracker and the response is:

https://github.com/Yubico/libfido2/issues/166#issuecomment-622991151

"Regarding OpenSSH and fido_init(), OpenSSH should be calling 
fido_init(). There are currently no ill effects from not calling it, but 
that might change in the future."

So I'd suggest changing to something like:

#ifdef SK_DEBUG
     fido_init(FIDO_DEBUG);
#else
     fido_init(0);
#endif

- or define a new macro with value 0 or FIDO_DEBUG as appropriate.

Regards,

Brian.