net: remove extra newlines

Signed-off-by: Sheng Yong <shengyong1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/net/ipv6.h
Simple merge

diff --cc net/core/skbuff.c
Simple merge

diff --cc net/ipv4/ip_output.c
Simple merge

diff --cc net/ipv4/udp.c
Simple merge

diff --cc net/ipv6/udp.c
Simple merge