usb: gadget: legacy: fix error return code in cdc_bind()

BugLink: https://bugs.launchpad.net/bugs/1881356

commit e8f7f9e3 upstream.

If 'usb_otg_descriptor_alloc()' fails, we must return a
negative error code -ENOMEM, not 0.

Fixes: ab6796ae ("usb: gadget: cdc2: allocate and init otg descriptor by otg capabilities")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

drivers/usb/gadget/legacy/cdc2.c

@@ -183,8 +183,10 @@ static int cdc_bind(struct usb_composite_dev *cdev)
 		struct usb_descriptor_header *usb_desc;
 
 		usb_desc = usb_otg_descriptor_alloc(gadget);
-		if (!usb_desc)
+		if (!usb_desc) {
+			status = -ENOMEM;
 			goto fail1;
+		}
 		usb_otg_descriptor_init(gadget, usb_desc);
 		otg_desc[0] = usb_desc;
 		otg_desc[1] = NULL;