qlcnic: Fix diagnostic test for all adapters.

o Driver should re-allocate all Tx queues after completing
  diagnostic tests. This regression was added by commit id
  c2c5e3a0

 ("qlcnic: Enable
  diagnostic test for multiple Tx queues.")

Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>