pinctrl: at91: fix a couple NULL vs IS_ERR() checks

The devm_kasprintf_strarray() function doesn't return NULL on error,
it returns error pointers.  Update the checks accordingly.

Fixes: f494c191 ("pinctrl: at91: use devm_kasprintf() to avoid potential leaks (part 2)")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Ryan Wanner <ryan.wanner@microchip.com>
Link: https://lore.kernel.org/r/5697980e-f687-47a7-9db8-2af34ae464bd@kili.mountainSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-at91.c

@@ -1389,8 +1389,8 @@ static int at91_pinctrl_probe(struct platform_device *pdev)
 		char **names;
 
 		names = devm_kasprintf_strarray(dev, "pio", MAX_NB_GPIO_PER_BANK);
-		if (!names)
-			return -ENOMEM;
+		if (IS_ERR(names))
+			return PTR_ERR(names);
 
 		for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) {
 			char *name = names[j];
@@ -1870,8 +1870,8 @@ static int at91_gpio_probe(struct platform_device *pdev)
 	}
 
 	names = devm_kasprintf_strarray(dev, "pio", chip->ngpio);
-	if (!names)
-		return -ENOMEM;
+	if (IS_ERR(names))
+		return PTR_ERR(names);
 
 	for (i = 0; i < chip->ngpio; i++)
 		strreplace(names[i], '-', alias_idx + 'A');