[NETFILTER]: fix sparse gfp nocast warnings

Fix implicit nocast warnings in nfnetlink code:
net/netfilter/nfnetlink.c:204:43: warning: implicit cast to nocast type
Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/netfilter/nfnetlink.c

@@ -195,7 +195,8 @@ nfnetlink_check_attributes(struct nfnetlink_subsystem *subsys,
 
 int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
 {
-	int allocation = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
+	unsigned int __nocast allocation =
+			in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
 	int err = 0;
 
 	NETLINK_CB(skb).dst_group = group;