staging/comedi: use comedi_usb_driver_(un)register for init/deinit
Instead of coding calling comedi_driver_(un)register and usb_(de)register directly we can use the comedi_usb_driver_(un)register wrapper. This removes some boilerplate and is less error prone. Signed-off-by: Peter Huewe <peterhuewe@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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