rtc: rtc-coh901331: remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release or
on probe failure, since commit 0998d063 ("device-core: Ensure drvdata
= NULL when no driver is bound").  Thus, it is not needed to manually
clear the device driver data to NULL.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-coh901331.c

@@ -154,10 +154,8 @@ static int __exit coh901331_remove(struct platform_device *pdev)
 {
 	struct coh901331_port *rtap = dev_get_drvdata(&pdev->dev);
 
-	if (rtap) {
+	if (rtap)
 		clk_unprepare(rtap->clk);
-		platform_set_drvdata(pdev, NULL);
-	}
 
 	return 0;
 }
@@ -220,7 +218,6 @@ static int __init coh901331_probe(struct platform_device *pdev)
 	return 0;
 
  out_no_rtc:
-	platform_set_drvdata(pdev, NULL);
 	clk_unprepare(rtap->clk);
 	return ret;
 }