power: supply: generic-adc-battery: drop memory alloc error message

Error printing happens automatically for memory allocation problems.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

drivers/power/supply/generic-adc-battery.c

@@ -243,10 +243,8 @@ static int gab_probe(struct platform_device *pdev)
 	bool any = false;
 
 	adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL);
-	if (!adc_bat) {
-		dev_err(&pdev->dev, "failed to allocate memory\n");
+	if (!adc_bat)
 		return -ENOMEM;
-	}
 
 	psy_cfg.drv_data = adc_bat;
 	psy_desc = &adc_bat->psy_desc;