Set checksum for NWC24Config during creation

[noahpistilli]

In the KD request IOCTL_NWC24_REQUEST_GENERATED_USER_ID, the nwc24msg.cfg and nwc24msg.cbk have many of their fields edited, such as the Wii Friend Code and creation stage.

However, the checksum was not being written, causing whatever calls the request to delete the edited data and revert back to the default files.

By writing the checksum, the Wii Number is properly written along with the creation stage and increment id, which should allow for IOCTL_NWC24_REQUEST_REGISTER_USER_ID to properly be handled with the default Wii NAND in the future.

[AdmiralCurtiss]

Sounds reasonable, but two things:

• Is it necessary to write the backup file too? What exactly is the behavior of that on console, if you know it?
• WriteCBK() and WriteConfig() are identical apart from the path; you can probably refactor that to one common function that you pass the path to.

[noahpistilli]

It doesn't seem to be necessary to write the backup file, however that is what the console does when IOCTL_NWC24_REQUEST_GENERATED_USER_ID is called. I haven't observed any different behaviour if the file is not written, albeit there isn't much to observe as I do not know when IOCTL_NWC24_REQUEST_REGISTER_USER_ID is called.

[AdmiralCurtiss]

Untested.