[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: NEric Dumazet <dada1@cosmosbay.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/fib_trie.c

@@ -391,7 +391,6 @@ static struct tnode* tnode_new(t_key key, int pos, int bits)
 	struct tnode *tn = tnode_alloc(sz);
 
 	if (tn) {
-		memset(tn, 0, sz);
 		tn->parent = T_TNODE;
 		tn->pos = pos;
 		tn->bits = bits;