watchdog: ts4800: release syscon device node in ts4800_wdt_probe()

Put syscon device node when it is not needed anymore.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/ts4800_wdt.c

···
 	/* set regmap and offset to know where to write */
 	wdt->feed_offset = reg;
 	wdt->regmap = syscon_node_to_regmap(syscon_np);
+	of_node_put(syscon_np);
 	if (IS_ERR(wdt->regmap)) {
 		dev_err(&pdev->dev, "cannot get parent's regmap\n");
 		return PTR_ERR(wdt->regmap);