net: clean up net/ipv4/fib_frontend.c fib_hash.c ip_gre.c

Signed-off-by: Jianjun Kong <jianjun@zeuux.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

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

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