staging: wlan-ng: improved readability of function prism2_add_key

Improve readability of prism2_add_key:
a) Reduce nesting and removed goto statement by using more return statements.
Signed-off-by: Chris Opperman <eklikeroomys@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlan-ng/cfg80211.c

@@ -148,40 +148,26 @@ static int prism2_add_key(struct wiphy *wiphy, struct net_device *dev,
 	struct wlandevice *wlandev = dev->ml_priv;
 	u32 did;
 
-	int err = 0;
-	int result = 0;
-
 	if (key_index >= NUM_WEPKEYS)
 		return -EINVAL;
 
-	switch (params->cipher) {
-	case WLAN_CIPHER_SUITE_WEP40:
-	case WLAN_CIPHER_SUITE_WEP104:
-		result = prism2_domibset_uint32(wlandev,
+	if (params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
+	    params->cipher != WLAN_CIPHER_SUITE_WEP104) {
+		pr_debug("Unsupported cipher suite\n");
+		return -EFAULT;
+	}
+
+	if (prism2_domibset_uint32(wlandev,
 				   DIDmib_dot11smt_dot11PrivacyTable_dot11WEPDefaultKeyID,
-						key_index);
-		if (result)
-			goto exit;
+				   key_index))
+		return -EFAULT;
 
 	/* send key to driver */
 	did = DIDmib_dot11smt_dot11WEPDefaultKeysTable_key(key_index + 1);
 
-		result = prism2_domibset_pstr32(wlandev, did,
-						params->key_len, params->key);
-		if (result)
-			goto exit;
-		break;
-
-	default:
-		pr_debug("Unsupported cipher suite\n");
-		result = 1;
-	}
-
-exit:
-	if (result)
-		err = -EFAULT;
-
-	return err;
+	if (prism2_domibset_pstr32(wlandev, did, params->key_len, params->key))
+		return -EFAULT;
+	return 0;
 }
 
 static int prism2_get_key(struct wiphy *wiphy, struct net_device *dev,