media: platform: exynos4-is: return callee's error code rather than -ENXIO

Clang static analyzer complains that value stored to 'ret' is never read.
Return the callee's error code to fix this.
Signed-off-by: Su Hui <suhui@nfschina.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

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

@@ -814,7 +814,7 @@ static int fimc_clk_get(struct fimc_dev *fimc)
 	fimc_clk_put(fimc);
 	dev_err(&fimc->pdev->dev, "failed to get clock: %s\n",
 		fimc_clocks[i]);
-	return -ENXIO;
+	return ret;
 }
 
 #ifdef CONFIG_PM