hw/usb/hcd-ehci-pci: Simplify using DEVICE_GET_CLASS() macro

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/hw/usb/hcd-ehci-pci.c b/hw/usb/hcd-ehci-pci.c
index 4c37c8e..345444a 100644
--- a/hw/usb/hcd-ehci-pci.c
+++ b/hw/usb/hcd-ehci-pci.c
@@ -74,7 +74,7 @@
 
 static void usb_ehci_pci_init(Object *obj)
 {
-    DeviceClass *dc = OBJECT_GET_CLASS(DeviceClass, obj, TYPE_DEVICE);
+    DeviceClass *dc = DEVICE_GET_CLASS(obj);
     EHCIPCIState *i = PCI_EHCI(obj);
     EHCIState *s = &i->ehci;