watchdog: skip min and max timeout validity check when max_hw_heartbeat_ms is defined

When max_hw_heartbeat_ms has a none zero value, max_timeout is not used.
So it's value can be 0. In such case if a driver uses min_timeout
functionality, then check will always fail.

This patch fixes above issue.
Signed-off-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Fu Wei <fu.wei@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/watchdog_core.c

@@ -88,7 +88,7 @@ static void watchdog_check_min_max_timeout(struct watchdog_device *wdd)
 	 * Check that we have valid min and max timeout values, if
 	 * not reset them both to 0 (=not used or unknown)
 	 */
-	if (wdd->min_timeout > wdd->max_timeout) {
+	if (!wdd->max_hw_heartbeat_ms && wdd->min_timeout > wdd->max_timeout) {
 		pr_info("Invalid min and max timeout values, resetting to 0!\n");
 		wdd->min_timeout = 0;
 		wdd->max_timeout = 0;