net: z85230: replace comparison to NULL with "!skb"
According to the chackpatch.pl, comparison to NULL could be written "!skb". 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>
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