Fix some spelling mistakes in comments:
Dont  ==> Don't
timout  ==> timeout
incomming  ==> incoming
necesarry  ==> necessary
substract  ==> subtract
Signed-off-by: NZheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>