radeonfb: Use __pci_complete_power_transition()

Use __pci_complete_power_transition() to finalize the transition into
D2 after programming the PMCSR of the device directly.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/video/aty/radeon_pm.c b/drivers/video/aty/radeon_pm.c
index c6d7cc7..1de0c00 100644
--- a/drivers/video/aty/radeon_pm.c
+++ b/drivers/video/aty/radeon_pm.c
@@ -2582,7 +2582,7 @@
 		 * calling pci_set_power_state()
 		 */
 		radeonfb_whack_power_state(rinfo, PCI_D2);
-		pci_set_power_state(rinfo->pdev, PCI_D2);
+		__pci_complete_power_transition(rinfo->pdev, PCI_D2);
 	} else {
 		printk(KERN_DEBUG "radeonfb (%s): switching to D0 state...\n",
 		       pci_name(rinfo->pdev));