drivers/rtc/rtc-spear.c: fix use-after-free in spear_rtc_remove()

`config' is freed and is then used in the rtc_device_unregister() call,
causing a kernel panic.
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Reviewed-by: Viresh Kumar <viresh.linux@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-spear.c

@@ -458,12 +458,12 @@ static int __devexit spear_rtc_remove(struct platform_device *pdev)
 	clk_disable(config->clk);
 	clk_put(config->clk);
 	iounmap(config->ioaddr);
-	kfree(config);
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (res)
 		release_mem_region(res->start, resource_size(res));
 	platform_set_drvdata(pdev, NULL);
 	rtc_device_unregister(config->rtc);
+	kfree(config);
 
 	return 0;
 }