watchdog: marvell_gti_wdt: Fix error code in probe()

This error path accidentally returns success.  Return -EINVAL instead.

Fixes: ef9e7fe ("Watchdog: Add marvell GTI watchdog driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Bharat Bhushan <bbhushan2@marvell.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/af326fd7-ac71-43a1-b7de-81779b61d242@moroto.mountain
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: Dan Carpenter

drivers/watchdog/marvell_gti_wdt.c

@@ -271,7 +271,7 @@ static int gti_wdt_probe(struct platform_device *pdev)
 				   &wdt_idx);
 	if (!err) {
 		if (wdt_idx >= priv->data->gti_num_timers)
-			return dev_err_probe(&pdev->dev, err,
+			return dev_err_probe(&pdev->dev, -EINVAL,
 				"GTI wdog timer index not valid");
 
 		priv->wdt_timer_idx = wdt_idx;