selinux: remove unused variabled in the netport, netnode, and netif caches

This patch removes the unused return code variable in the netport,
netnode, and netif initialization functions.

Reported-by: fengguang.wu@intel.com
Signed-off-by: Paul Moore <pmoore@redhat.com>
diff --git a/security/selinux/netif.c b/security/selinux/netif.c
index 3c3de4c..50ce177 100644
--- a/security/selinux/netif.c
+++ b/security/selinux/netif.c
@@ -272,7 +272,7 @@
 
 static __init int sel_netif_init(void)
 {
-	int i, err;
+	int i;
 
 	if (!selinux_enabled)
 		return 0;
@@ -282,7 +282,7 @@
 
 	register_netdevice_notifier(&sel_netif_netdev_notifier);
 
-	return err;
+	return 0;
 }
 
 __initcall(sel_netif_init);