bna: potential null dereference

[Jiri Slaby]

Hi,

stanse found a potential null dereference:
bnad_cb_tx_cleanup
  -> struct bnad_unmap_q *unmap_q = tcb->unmap_q;
  -> -- tcb cannot be null now --
  -> if (!tcb || (!tcb->unmap_q))

The thing is I have no idea whether the second parameter of cleanup may
be null (move assignment after the check) or not (remove the check)

Could you fix that?

thanks,
-- 
js
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