[PATCH] ARM: mach-imx: cpu: Include <linux/err.h>

Commit e709f38cd7 (ARM: imx6: report soc info via soc device) causes the 
following build error on imx_v4_v5_defconfig:

arch/arm/mach-imx/cpu.c: In function 'imx_soc_device_init':
arch/arm/mach-imx/cpu.c:129:2: error: implicit declaration of function 'IS_ERR' [-Werror=implicit-function-declaration]

Include <linux/err.h> to fix it.

Signed-off-by: Fabio Estevam <redacted>
---
 arch/arm/mach-imx/cpu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-imx/cpu.c b/arch/arm/mach-imx/cpu.c
index fae2c9a..c862402 100644
--- a/arch/arm/mach-imx/cpu.c
+++ b/arch/arm/mach-imx/cpu.c

@@ -1,4 +1,5 @@
 
+#include <linux/err.h>
 #include <linux/module.h>
 #include <linux/io.h>
 #include <linux/of.h>

-- 
1.8.1.2