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/imx-uart.h b/arch/arm/plat-mxc/include/mach/imx-uart.h
index 599217b..90af4d9 100644
--- a/arch/arm/plat-mxc/include/mach/imx-uart.h
+++ b/arch/arm/plat-mxc/include/mach/imx-uart.h
@@ -23,7 +23,7 @@
 
 struct imxuart_platform_data {
 	int (*init)(struct platform_device *pdev);
-	int (*exit)(struct platform_device *pdev);
+	void (*exit)(struct platform_device *pdev);
 	unsigned int flags;
 };