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/netnode.c b/security/selinux/netnode.c
index ddf3152..da923f8 100644
--- a/security/selinux/netnode.c
+++ b/security/selinux/netnode.c
@@ -303,7 +303,6 @@
 static __init int sel_netnode_init(void)
 {
 	int iter;
-	int ret;
 
 	if (!selinux_enabled)
 		return 0;
@@ -313,7 +312,7 @@
 		sel_netnode_hash[iter].size = 0;
 	}
 
-	return ret;
+	return 0;
 }
 
 __initcall(sel_netnode_init);