staging: ks7010: change netdev_dbg msg to avoid a long line

This commit avoids a long line changing a bit message in
_ks_wlan_hw_power_save function.

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