staging: ks7010: refactor ks_wlan_set_sleep_mode function

This commit refactors ks_wlan_set_sleep_mode function
avoiding to use switch-case statement ans using simple
if logic to handle invalid values first. This simplifies
data paths as well as improves readability.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ks7010/ks_wlan_net.c

@@ -2028,21 +2028,19 @@ static int ks_wlan_set_sleep_mode(struct net_device *dev,
 {
 	struct ks_wlan_private *priv = netdev_priv(dev);
 
-	if (*uwrq == SLP_SLEEP) {
+	if (*uwrq != SLP_SLEEP &&
+	    *uwrq != SLP_ACTIVE) {
+		netdev_err(dev, "SET_SLEEP_MODE %d error\n", *uwrq);
+		return -EINVAL;
+	}
+
 	priv->sleep_mode = *uwrq;
 	netdev_info(dev, "SET_SLEEP_MODE %d\n", priv->sleep_mode);
 
+	if (*uwrq == SLP_SLEEP)
 		hostif_sme_enqueue(priv, SME_STOP_REQUEST);
-		hostif_sme_enqueue(priv, SME_SLEEP_REQUEST);
 
-	} else if (*uwrq == SLP_ACTIVE) {
-		priv->sleep_mode = *uwrq;
-		netdev_info(dev, "SET_SLEEP_MODE %d\n", priv->sleep_mode);
 	hostif_sme_enqueue(priv, SME_SLEEP_REQUEST);
-	} else {
-		netdev_err(dev, "SET_SLEEP_MODE %d error\n", *uwrq);
-		return -EINVAL;
-	}
 
 	return 0;
 }