ath9k: Use a defined value for pci_set_power_state()

Silence sparse by using a defined value PCI_D3hot instead of a magic
constant in a pci_set_power_state() call.
Signed-off-by: NJouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/main.c

@@ -2692,7 +2692,7 @@ static int ath_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 
 	pci_save_state(pdev);
 	pci_disable_device(pdev);
-	pci_set_power_state(pdev, 3);
+	pci_set_power_state(pdev, PCI_D3hot);
 
 	return 0;
 }