rtc/m48t59: kfree(NULL) is OK

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Paul Gortmaker <p_gortmaker@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-m48t59.c

@@ -506,7 +506,6 @@ out:
 		free_irq(m48t59->irq, &pdev->dev);
 	if (m48t59->ioaddr)
 		iounmap(m48t59->ioaddr);
-	if (m48t59)
 		kfree(m48t59);
 	return ret;
 }