Usage of kfree() requires slab.h header.  Otherwise building on x86_64
with COMPILE_TEST fails with:

    drivers/clk/samsung/clk-exynos5433.c: In function ‘exynos5433_cmu_probe’:
    drivers/clk/samsung/clk-exynos5433.c:5598:4: error: implicit declaration of 
function ‘kfree’; did you mean ‘vfree’? [-Werror=implicit-function-declaration]

Reported-by: kbuild test robot <l...@intel.com>
Signed-off-by: Krzysztof Kozlowski <k...@kernel.org>
---
 drivers/clk/samsung/clk-exynos5433.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/samsung/clk-exynos5433.c 
b/drivers/clk/samsung/clk-exynos5433.c
index 0b60316331a0..4b1aa9382ad2 100644
--- a/drivers/clk/samsung/clk-exynos5433.c
+++ b/drivers/clk/samsung/clk-exynos5433.c
@@ -13,6 +13,7 @@
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/slab.h>
 
 #include <dt-bindings/clock/exynos5433.h>
 
-- 
2.17.1

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