isdn: remove duplicate NULL check
We test both "!skb_out" and "skb_out" here which is duplicative and causes a static checker warning. I considered that the intent might have been to test "skb_in" but that's a valid pointer here. Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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