media: exynos4-is: Remove call to memset after dma_alloc_coherent

In commit 518a2f19
("dma-mapping: zero memory returned from dma_alloc_*"),
dma_alloc_coherent has already zeroed the memory.
So memset is not needed
Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/exynos4-is/fimc-is.c

@@ -341,7 +341,6 @@ static int fimc_is_alloc_cpu_memory(struct fimc_is *is)
 		return -ENOMEM;
 
 	is->memory.size = FIMC_IS_CPU_MEM_SIZE;
-	memset(is->memory.vaddr, 0, is->memory.size);
 
 	dev_info(dev, "FIMC-IS CPU memory base: %#x\n", (u32)is->memory.paddr);