[IPV4] fib_trie: removes a memset() call in tnode_new()

tnode_alloc() already clears allocated memory, using kcalloc() or
alloc_pages(GFP_KERNEL|__GFP_ZERO, ...)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 350904c..da6681d 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -391,7 +391,6 @@
 	struct tnode *tn = tnode_alloc(sz);
 
 	if (tn) {
-		memset(tn, 0, sz);
 		tn->parent = T_TNODE;
 		tn->pos = pos;
 		tn->bits = bits;