leds: Remove duplicated OOM message for individual driver

The OOM message of individual driver is unnecessary, and this is
duplicate the memory subsystem generic OOM message.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
diff --git a/drivers/leds/leds-adp5520.c b/drivers/leds/leds-adp5520.c
index 86b5bdb..5036d7b 100644
--- a/drivers/leds/leds-adp5520.c
+++ b/drivers/leds/leds-adp5520.c
@@ -120,13 +120,10 @@
 
 	led = devm_kzalloc(&pdev->dev, sizeof(*led) * pdata->num_leds,
 				GFP_KERNEL);
-	if (led == NULL) {
-		dev_err(&pdev->dev, "failed to alloc memory\n");
+	if (!led)
 		return -ENOMEM;
-	}
 
 	ret = adp5520_led_prepare(pdev);
-
 	if (ret) {
 		dev_err(&pdev->dev, "failed to write\n");
 		return ret;