usb: common: usb-conn-gpio: Simplify some error message

dev_err_probe() already prints the error code in a human readable way, so
there is no need to duplicate it as a numerical value at the end of the
message.
Reviewed-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/7505a9dfa1e097070c492d6f6f84afa2a490b040.1659763173.git.christophe.jaillet@wanadoo.frSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/common/usb-conn-gpio.c

@@ -208,10 +208,8 @@ static int usb_conn_probe(struct platform_device *pdev)
 	if (PTR_ERR(info->vbus) == -ENODEV)
 		info->vbus = NULL;
 
-	if (IS_ERR(info->vbus)) {
-		ret = PTR_ERR(info->vbus);
-		return dev_err_probe(dev, ret, "failed to get vbus :%d\n", ret);
-	}
+	if (IS_ERR(info->vbus))
+		return dev_err_probe(dev, PTR_ERR(info->vbus), "failed to get vbus\n");
 
 	info->role_sw = usb_role_switch_get(dev);
 	if (IS_ERR(info->role_sw))