Fix the following coccicheck warnings:

 ./net/ipv4/esp4_offload.c:288:32-34: WARNING !A || A && B is
equivalent to !A || B.
Reported-by: NAbaci Robot <abaci@linux.alibaba.com>
Signed-off-by: NJiapeng Zhong <abaci-bugfix@linux.alibaba.com>
Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com>