USB: r8a66597-hcd: fix driver removing

Fixed the problem that accessed register of this controller after
having called iounmap().

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index 64fba53c..ae8ec44 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -2126,8 +2126,8 @@
 	struct usb_hcd		*hcd = r8a66597_to_hcd(r8a66597);
 
 	del_timer_sync(&r8a66597->rh_timer);
-	iounmap((void *)r8a66597->reg);
 	usb_remove_hcd(hcd);
+	iounmap((void *)r8a66597->reg);
 	usb_put_hcd(hcd);
 	return 0;
 }