Note: usage of legacy PM stuff

[Holger Schurig]

Currently, main.c contains following code:

        if (!(wlan_pm_dev = pm_register(PM_UNKNOWN_DEV, 0, wlan_pm_callback)))
                lbs_pr_alert( "failed to register PM callback\n");

pm_register() is defined in include/linux/pm_legacy.h
and only available when CONFIG_PM_LEGACY is set.

You won't notice that because ENABLE_PM is not set, but I guess
this issue should be put into the TODO list at
http://wiki.laptop.org/go/Libertas_todo ?!?