6lowpan: Remove unused pointer in lowpan_header_create()

Commit 8df8c56a (6lowpan: Moving generic compression code into 6lowpan_iphc.c)
left pointer 'hdr' unused - remove it.

Detected by Coverity: CID 1164868.
Signed-off-by: NChristian Engelmayer <cengelma@gmx.at>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ieee802154/6lowpan.c

@@ -106,7 +106,6 @@ static int lowpan_header_create(struct sk_buff *skb,
 			   unsigned short type, const void *_daddr,
 			   const void *_saddr, unsigned int len)
 {
-	struct ipv6hdr *hdr;
 	const u8 *saddr = _saddr;
 	const u8 *daddr = _daddr;
 	struct ieee802154_addr sa, da;
@@ -117,8 +116,6 @@ static int lowpan_header_create(struct sk_buff *skb,
 	if (type != ETH_P_IPV6)
 		return 0;
 
-	hdr = ipv6_hdr(skb);
-
 	if (!saddr)
 		saddr = dev->dev_addr;