rtc: rtc-jz4740: remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release or
on probe failure, since commit 0998d063100 ("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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-jz4740.c

@@ -287,7 +287,6 @@ err_free_irq:
 err_unregister_rtc:
 	rtc_device_unregister(rtc->rtc);
 err_iounmap:
-	platform_set_drvdata(pdev, NULL);
 	iounmap(rtc->base);
 err_release_mem_region:
 	release_mem_region(rtc->mem->start, resource_size(rtc->mem));
@@ -310,8 +309,6 @@ static int jz4740_rtc_remove(struct platform_device *pdev)
 
 	kfree(rtc);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return 0;
 }