ipw2x00: cleanup dead code

Fix smatch warning:

drivers/net/wireless/intel/ipw2x00/ipw2100.c:5606
 shim__set_security() warn: always true condition '(sec->active_key <= 3) => (0-3 <= 3)'
drivers/net/wireless/intel/ipw2x00/ipw2200.c:10725
 shim__set_security() warn: always true condition '(sec->active_key <= 3) => (0-3 <= 3)'
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/intel/ipw2x00/ipw2100.c

@@ -5603,12 +5603,8 @@ static void shim__set_security(struct net_device *dev,
 
 	if ((sec->flags & SEC_ACTIVE_KEY) &&
 	    priv->ieee->sec.active_key != sec->active_key) {
-		if (sec->active_key <= 3) {
 		priv->ieee->sec.active_key = sec->active_key;
 		priv->ieee->sec.flags |= SEC_ACTIVE_KEY;
-		} else
-			priv->ieee->sec.flags &= ~SEC_ACTIVE_KEY;
-
 		priv->status |= STATUS_SECURITY_UPDATED;
 	}
 

drivers/net/wireless/intel/ipw2x00/ipw2200.c

@@ -10722,11 +10722,8 @@ static void shim__set_security(struct net_device *dev,
 	}
 
 	if (sec->flags & SEC_ACTIVE_KEY) {
-		if (sec->active_key <= 3) {
 		priv->ieee->sec.active_key = sec->active_key;
 		priv->ieee->sec.flags |= SEC_ACTIVE_KEY;
-		} else
-			priv->ieee->sec.flags &= ~SEC_ACTIVE_KEY;
 		priv->status |= STATUS_SECURITY_UPDATED;
 	} else
 		priv->ieee->sec.flags &= ~SEC_ACTIVE_KEY;