media: s5p-jpeg: don't return a value on a void function

Building this driver on arm64 gives this warning:
	drivers/media/platform/s5p-jpeg/jpeg-hw-exynos3250.c:430:16: error: return expression in void function
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Reviewed-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Acked-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/s5p-jpeg/jpeg-hw-exynos3250.c

@@ -427,7 +427,7 @@ unsigned int exynos3250_jpeg_get_int_status(void __iomem *regs)
 void exynos3250_jpeg_clear_int_status(void __iomem *regs,
 				      unsigned int value)
 {
-	return writel(value, regs + EXYNOS3250_JPGINTST);
+	writel(value, regs + EXYNOS3250_JPGINTST);
 }
 
 unsigned int exynos3250_jpeg_operating(void __iomem *regs)