rtc: ds1307: check for failed memory allocation on wdt

Currently a failed memory allocation will lead to a null pointer
dereference on point wdt.  Fix this by checking for a failed
allocation and just returning.

Addresses-Coverity: ("Dereference null return")
Fixes: fd90d48 ("rtc: ds1307: add support for watchdog timer on ds1388")

Signed-off-by: Colin Ian King <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexandre Belloni <[email protected]>

Author: Colin Ian King

drivers/rtc/rtc-ds1307.c

@@ -1673,6 +1673,8 @@ static void ds1307_wdt_register(struct ds1307 *ds1307)
 		return;
 
 	wdt = devm_kzalloc(ds1307->dev, sizeof(*wdt), GFP_KERNEL);
+	if (!wdt)
+		return;
 
 	wdt->info = &ds1388_wdt_info;
 	wdt->ops = &ds1388_wdt_ops;