media: exynos4-is: Change clk_disable to clk_disable_unprepare

The corresponding API for clk_prepare_enable is clk_disable_unprepare,
other than clk_disable.

Fix this by changing clk_disable to clk_disable_unprepare.

Fixes: b4155d7d ("[media] exynos4-is: Ensure fimc-is clocks are not enabled until properly configured")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

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

@@ -140,7 +140,7 @@ static int fimc_is_enable_clocks(struct fimc_is *is)
 			dev_err(&is->pdev->dev, "clock %s enable failed\n",
 				fimc_is_clocks[i]);
 			for (--i; i >= 0; i--)
-				clk_disable(is->clocks[i]);
+				clk_disable_unprepare(is->clocks[i]);
 			return ret;
 		}
 		pr_debug("enabled clock: %s\n", fimc_is_clocks[i]);