Staging: w35und: module init cleanup

This patch cleans up the module init functions a bit and removes the redundant
device ID check from wb35_probe() function.

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