Staging: wlan-ng: Improved case statements in p80211req_mibset_mibget()

This patch improves code from p80211req_mibset_mibget() function by
taking into account that every
DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKeyX with
X in {0, 1, 2, 3} is a bit mask where the (P80211DID_MASK_ITEM <<
P80211DID_LSB_ITEM) mask aka 0x0x0003f000 mask keeps bits representing
the DID item number. To get this item number use P80211DID_ITEM().

Signed-off-by: Claudiu Beznea <claudiu.beznea@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlan-ng/p80211req.c

@@ -185,26 +185,16 @@ static void p80211req_mibset_mibget(wlandevice_t *wlandev,
 	u8 *key = mibitem->data + sizeof(p80211pstrd_t);
 
 	switch (mibitem->did) {
-	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey0:{
+	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey0:
+	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey1:
+	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey2:
+	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey3:
 		if (!isget)
-			wep_change_key(wlandev, 0, key, pstr->len);
-	break;
-	}
-	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey1:{
-		if (!isget)
-			wep_change_key(wlandev, 1, key, pstr->len);
-	break;
-	}
-	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey2:{
-		if (!isget)
-			wep_change_key(wlandev, 2, key, pstr->len);
-	break;
-	}
-	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey3:{
-		if (!isget)
-			wep_change_key(wlandev, 3, key, pstr->len);
-	break;
-	}
+			wep_change_key(wlandev,
+				       P80211DID_ITEM(mibitem->did) - 1,
+				       key, pstr->len);
+		break;
+
 	case DIDmib_dot11smt_dot11PrivacyTable_dot11WEPDefaultKeyID:{
 		u32 *data = (u32 *) mibitem->data;