Note that the auxiliary bus API has separate init and add steps, which requires more attention in the error unwinding paths. The main loop needs to deal with kfree() and auxiliary_device_uninit() for the current iteration before jumping to the common label which releases everything allocated in prior iterations.
The init/add steps can be moved together in the aux bus code if that makes this usage simpler. Please do that instead.
IIRC the two steps were separated during the auxbus reviews to allow the parent to call kfree() on an init failure, and auxiliary_device_uninit() afterwards.
https://www.kernel.org/doc/html/latest/driver-api/auxiliary_bus.html#auxilia...
With a single auxbus_register(), the parent wouldn't know whether to use kfree() or auxiliary_device_uinit() when an error is returned, would it?