[IPV4] ARP: Remove not used code

In arp_process() (net/ipv4/arp.c), there is unused code: definition
and assignment of tha (target hw address ).
Signed-off-by: Mark Ryden <markryde@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/arp.c

@@ -706,7 +706,7 @@ static int arp_process(struct sk_buff *skb)
 	struct arphdr *arp;
 	unsigned char *arp_ptr;
 	struct rtable *rt;
-	unsigned char *sha, *tha;
+	unsigned char *sha;
 	__be32 sip, tip;
 	u16 dev_type = dev->type;
 	int addr_type;
@@ -771,7 +771,6 @@ static int arp_process(struct sk_buff *skb)
 	arp_ptr += dev->addr_len;
 	memcpy(&sip, arp_ptr, 4);
 	arp_ptr += 4;
-	tha	= arp_ptr;
 	arp_ptr += dev->addr_len;
 	memcpy(&tip, arp_ptr, 4);
 /*