ARM: mach-imx: iomux-imx31: fix spelling mistake in error message

Minor issue, fix spelling mistake, nonexistant -> nonexistent
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/mach-imx/iomux-imx31.c

@@ -100,7 +100,7 @@ int mxc_iomux_alloc_pin(unsigned int pin, const char *label)
 	unsigned pad = pin & IOMUX_PADNUM_MASK;
 
 	if (pad >= (PIN_MAX + 1)) {
-		printk(KERN_ERR "mxc_iomux: Attempt to request nonexistant pin %u for \"%s\"\n",
+		printk(KERN_ERR "mxc_iomux: Attempt to request nonexistent pin %u for \"%s\"\n",
 			pad, label ? label : "?");
 		return -EINVAL;
 	}