gpio: use (!foo) instead of (foo == NULL)

Signed-off-by: Varka Bhadram <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
diff --git a/drivers/gpio/gpio-da9052.c b/drivers/gpio/gpio-da9052.c
index 389a4d2..2e9578e 100644
--- a/drivers/gpio/gpio-da9052.c
+++ b/drivers/gpio/gpio-da9052.c
@@ -212,7 +212,7 @@
 	int ret;
 
 	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
-	if (gpio == NULL)
+	if (!gpio)
 		return -ENOMEM;
 
 	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);