airo : allow supend with card without power management

Some airo card don't support power Management [1]. Don't abort suspend with those cards.

00:06.0 Network controller: AIRONET Wireless Communications PC4800 (rev 01)

       Flags: medium devsel, IRQ 17
       Memory at dffffe00 (32-bit, non-prefetchable) [size=128]
       I/O ports at d000 [size=128]
       I/O ports at cc00 [size=64]
       Kernel driver in use: airo

Index: linux-2.6/drivers/net/wireless/airo.c
===================================================================
@@ -5660,7 +5660,8 @@
 

	pci_enable_wake(pdev, pci_choose_state(pdev, state), 1);
	pci_save_state(pdev);

- return pci_set_power_state(pdev, pci_choose_state(pdev, state));
+ pci_set_power_state(pdev, pci_choose_state(pdev, state));
+ return 0;
}

static int airo_pci_resume(struct pci_dev *pdev)