mwl8k: Fix broken WEP

The WEP key length was being set to 0 erroneously which broke WEP support.
Fix the same by setting the key length appropriately.
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwl8k.c

@@ -3997,7 +3997,7 @@ static int mwl8k_cmd_encryption_set_key(struct ieee80211_hw *hw,
 			mwl8k_vif->wep_key_conf[idx].enabled = 1;
 		}
 
-		keymlen = 0;
+		keymlen = key->keylen;
 		action = MWL8K_ENCR_SET_KEY;
 		break;
 	case WLAN_CIPHER_SUITE_TKIP: