ARM: mxc: iomux-v1: Fix build warning

Fix the following warning:

CC      arch/arm/plat-mxc/iomux-v1.o
arch/arm/plat-mxc/iomux-v1.c: In function 'mxc_gpio_setup_multiple_pins':
arch/arm/plat-mxc/iomux-v1.c:160: warning: 'ret' may be used uninitialized in this function
arch/arm/plat-mxc/iomux-v1.c:160: note: 'ret' was declared here

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/plat-mxc/iomux-v1.c b/arch/arm/plat-mxc/iomux-v1.c
index d76f3ac..1f73963 100644
--- a/arch/arm/plat-mxc/iomux-v1.c
+++ b/arch/arm/plat-mxc/iomux-v1.c
@@ -157,7 +157,7 @@
 static int imx_iomuxv1_setup_multiple(const int *list, unsigned count)
 {
 	size_t i;
-	int ret;
+	int ret = 0;
 
 	for (i = 0; i < count; ++i) {
 		ret = mxc_gpio_mode(list[i]);