coresight: syscfg: Fix memleak on registration failure in cscfg_create_device

In the Linux kernel, the following vulnerability has been resolved:

coresight: syscfg: Fix memleak on registration failure in cscfg_create_device

device_register() calls device_initialize(),

according to doc of device_initialize:

Use put_device() to give up your reference instead of freeing

* @dev directly once you have called this function.

To prevent potential memleak, use put_device() for error handling.