staging: ks7010: avoid if-else condition in ks_wlan_get_power

The if-else code in ks_wlan_get_power function is not needed
at all and can be achieved with a simple boolean assignation.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>