imx: exit functions can/should be void

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/plat-mxc/include/mach/usb.h b/arch/arm/plat-mxc/include/mach/usb.h
index 2dacb308..be27337 100644
--- a/arch/arm/plat-mxc/include/mach/usb.h
+++ b/arch/arm/plat-mxc/include/mach/usb.h
@@ -17,7 +17,7 @@
 
 struct imxusb_platform_data {
 	int (*init)(struct device *);
-	int (*exit)(struct device *);
+	void (*exit)(struct device *);
 };
 
 #endif /* __ASM_ARCH_MXC_USB */