cifXTKitAddDevice() does not return all possible errors

There are several errors which are not return by the function.
This is done by design, where it is acceptable that certain errors, like missing firmware or configuration files, handled later on by the host application.
With an error return in this case the application would expect, that the hardware was NOT added to the toolkit handling which also would prevent a later access of the hardware via the CIFX-API functions.

Such "internal" errors are stored in an addtional variable (lInitError) in the DEVICEINSTANCE structure.
Unfortunately the description of the additional error variable is missinging in the documentation.