drm/radeon: correct indentation

Correct indentation in radeon_driver_load_kms.
Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_kms.c

@@ -168,7 +168,7 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
 	if (!r) {
 		acpi_status = radeon_acpi_init(rdev);
 		if (acpi_status)
-		dev_dbg(dev->dev, "Error during ACPI methods call\n");
+			dev_dbg(dev->dev, "Error during ACPI methods call\n");
 	}
 
 	if (radeon_is_px(dev)) {