staging: ks7010: change local variable type in _ks_wlan_hw_power_save

Local variable 'byte' in _ks_wlan_hw_power_save function is declared
as unsigned char and can be declared as u8 which is preferred. It
is being using with ks7010_sdio_readb which expects u8 already.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ks7010/ks7010_sdio.c

@@ -217,7 +217,7 @@ void ks_wlan_hw_wakeup_request(struct ks_wlan_private *priv)
 
 static void _ks_wlan_hw_power_save(struct ks_wlan_private *priv)
 {
-	unsigned char byte;
+	u8 byte;
 	int ret;
 
 	if (priv->reg.power_mgmt == POWER_MGMT_ACTIVE)