static inline struct sk_buff *netlink_trim(struct sk_buff *skb, int allocation)
static inline struct sk_buff *netlink_trim(struct sk_buff *skb, unsigned int __nocast allocation)
static inline struct sk_buff *netlink_trim(struct sk_buff *skb, int allocation){	int delta;	skb_orphan(skb);	delta = skb->end - skb->tail;	if (delta * 2 < skb->truesize)		return skb;	if (skb_shared(skb)) {		struct sk_buff *nskb = skb_clone(skb, allocation);		if (!nskb)			return skb;		kfree_skb(skb);		skb = nskb;	}	if (!pskb_expand_head(skb, 0, -delta, allocation))		skb->truesize -= delta;	return skb;}