387847f2 Tue Jun 01 08:23:20 CDT 2021 Peng Li <lipeng321@huawei.com> net: hdlc: replace comparison to NULL with "!param"
According to the chackpatch.pl, comparison to NULL could be written "!param".
Signed-off-by: Peng Li <lipeng321@huawei.com> Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>