mfd: vexpress: Give the "leds-gpio" device a real parent

The registration of the "leds-gpio" device was using
"vexpress_sysreg_dev" as a parent before it was actually
set to something different than NULL.

Trivial fix by reordering the code.

Reported-by: Lorenzo Pieralisi <[e-mail]>
Signed-off-by: Pawel Moll <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

drivers/mfd/vexpress-sysreg.c

···
 		return err;
 	}
 
+	vexpress_sysreg_dev = &pdev->dev;
+
 	platform_device_register_data(vexpress_sysreg_dev, "leds-gpio",
 			PLATFORM_DEVID_AUTO, &vexpress_sysreg_leds_pdata,
 			sizeof(vexpress_sysreg_leds_pdata));
-
-	vexpress_sysreg_dev = &pdev->dev;
 
 	device_create_file(vexpress_sysreg_dev, &dev_attr_sys_id);