Staging: rtxxx0: remove dead virtual adapter support

* remove dead virtual adapter support
* remove needless rt28xx_ioctl() wrapper
* remove superfluous NULL checks

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
4 files changed