Staging: w35und: clean up comments in wbusb.c

Impact: cleanup

Remove some useless comments and clean up others.

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>