usb: gadget: use usb_string_ids_tab instead multiple usb_string_id()

Using usb_string_ids_tab() instead multiple calls of usb_string_id()
seems to be handy. It also allows to add string without many checks.

Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/cdc2.c

@@ -193,17 +193,11 @@ static int __init cdc_bind(struct usb_composite_dev *cdev)
 	snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
 		init_utsname()->sysname, init_utsname()->release,
 		gadget->name);
-	status = usb_string_id(cdev);
+	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
 		goto fail1;
-	strings_dev[STRING_MANUFACTURER_IDX].id = status;
-	device_desc.iManufacturer = status;
-
-	status = usb_string_id(cdev);
-	if (status < 0)
-		goto fail1;
-	strings_dev[STRING_PRODUCT_IDX].id = status;
-	device_desc.iProduct = status;
+	device_desc.iManufacturer = strings_dev[STRING_MANUFACTURER_IDX].id;
+	device_desc.iProduct = strings_dev[STRING_PRODUCT_IDX].id;
 
 	/* register our configuration */
 	status = usb_add_config(cdev, &cdc_config_driver, cdc_do_config);