ipv6: use skb_expand_head in ip6_finish_output2

Unlike skb_realloc_headroom, new helper skb_expand_head does not allocate
a new skb if possible.

Additionally this patch replaces commonly used dereferencing with variables.

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vasily Averin 2021-08-02 11:52:22 +03:00 • committed by David S. Miller
commit e415ed3a4b