[WATCHDOG] at32ap700x-wdt: add missing iounmap in _remove

Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

drivers/char/watchdog/at32ap700x_wdt.c

@@ -257,6 +257,7 @@ static int __exit at32_wdt_remove(struct platform_device *pdev)
 {
 	if (wdt && platform_get_drvdata(pdev) == wdt) {
 		misc_deregister(&wdt->miscdev);
+		iounmap(wdt->regs);
 		kfree(wdt);
 		wdt = NULL;
 		platform_set_drvdata(pdev, NULL);