Staging: usbip: Makefile: cleaned up Makefile cflag lines

Changed to use the proper ccflags-y option

Signed-off-by: Tracey Dent <tdent48227@gmail.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/usbip/Makefile

@@ -7,6 +7,5 @@ vhci-hcd-objs := vhci_sysfs.o vhci_tx.o vhci_rx.o vhci_hcd.o
 obj-$(CONFIG_USB_IP_HOST) += usbip.o
 usbip-objs := stub_dev.o stub_main.o stub_rx.o stub_tx.o
 
-ifeq ($(CONFIG_USB_IP_DEBUG_ENABLE),y)
-	EXTRA_CFLAGS += -DDEBUG
-endif
+ccflags-$(CONFIG_USB_IP_DEBUG_ENABLE) := -DDEBUG
+