ipv6: remove parameter rt from fib6_prune_clones()

the parameter rt will be assigned to c.arg in function fib6_clean_tree(),
but function fib6_prune_clone() doesn't use c.arg, so we can remove it
safely.
Signed-off-by: NDuan Jiong <duanj.fnst@cn.fujitsu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/ip6_fib.c

@@ -71,8 +71,7 @@ static DEFINE_RWLOCK(fib6_walker_lock);
 #define FWS_INIT FWS_L
 #endif
 
-static void fib6_prune_clones(struct net *net, struct fib6_node *fn,
-			      struct rt6_info *rt);
+static void fib6_prune_clones(struct net *net, struct fib6_node *fn);
 static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn);
 static struct fib6_node *fib6_repair_tree(struct net *net, struct fib6_node *fn);
 static int fib6_walk(struct fib6_walker_t *w);
@@ -941,7 +940,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info,
 	if (!err) {
 		fib6_start_gc(info->nl_net, rt);
 		if (!(rt->rt6i_flags & RTF_CACHE))
-			fib6_prune_clones(info->nl_net, pn, rt);
+			fib6_prune_clones(info->nl_net, pn);
 	}
 
 out:
@@ -1375,7 +1374,7 @@ int fib6_del(struct rt6_info *rt, struct nl_info *info)
 			pn = pn->parent;
 		}
 #endif
-		fib6_prune_clones(info->nl_net, pn, rt);
+		fib6_prune_clones(info->nl_net, pn);
 	}
 
 	/*
@@ -1600,10 +1599,9 @@ static int fib6_prune_clone(struct rt6_info *rt, void *arg)
 	return 0;
 }
 
-static void fib6_prune_clones(struct net *net, struct fib6_node *fn,
-			      struct rt6_info *rt)
+static void fib6_prune_clones(struct net *net, struct fib6_node *fn)
 {
-	fib6_clean_tree(net, fn, fib6_prune_clone, 1, rt);
+	fib6_clean_tree(net, fn, fib6_prune_clone, 1, NULL);
 }
 
 /*