xr_usb: Use tty_driver_kref_put for kernel 5.15 and above
xr_usb: Use tty_driver_kref_put for kernel 5.15 and above

put_tty_driver has been dropped at kernel version 5.15.

Signed-off-by: Marc Aurel Fritz <3da03edfeb780b1cca7d047ce9bfa7b1380eb333@pm.me>

kasbert/epsolar-tracer,kasbert/epsolar-tracer