pinctrl: stmfx: Do not check for 0 return after calling platform_get_irq()

Since commit ce753ad1 ("platform: finally disallow IRQ0 in
platform_get_irq() and its ilk"), there is no possible for
platform_get_irq() to return 0. Use the return value
from platform_get_irq().
Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20230803094304.733371-1-ruanjinjie@huawei.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-stmfx.c

@@ -659,8 +659,8 @@ static int stmfx_pinctrl_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0)
-		return -ENXIO;
+	if (irq < 0)
+		return irq;
 
 	mutex_init(&pctl->lock);