pinctrl: baytrail: Do not call WARN_ON for a firmware bug

WARN_ON causes a backtrace to get logged which is only useful for
kernel bugs. For signalling a firmware bug dev_warn(dev, FW_BUG "...")
should be used.

This fixes users running userspace software to monitor kernel oopses
getting a false positive bug-report every boot because of the wrong
use of WARN_ON.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/intel/pinctrl-baytrail.c

@@ -981,12 +981,12 @@ static int byt_gpio_request_enable(struct pinctrl_dev *pctl_dev,
 	 */
 	value = readl(reg) & BYT_PIN_MUX;
 	gpio_mux = byt_get_gpio_mux(vg, offset);
-	if (WARN_ON(gpio_mux != value)) {
+	if (gpio_mux != value) {
 		value = readl(reg) & ~BYT_PIN_MUX;
 		value |= gpio_mux;
 		writel(value, reg);
 
-		dev_warn(&vg->pdev->dev,
+		dev_warn(&vg->pdev->dev, FW_BUG
 			 "pin %u forcibly re-configured as GPIO\n", offset);
 	}