usb: roles: Take care of driver module reference counting

usb: roles: Take care of driver module reference counting

commit 5c54fcac9a9de559b444ac63ec3cd82f1d157a0b upstream.

This fixes potential "BUG: unable to handle kernel paging
request at ..." from happening.

Cc: <stable@vger.kernel.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>