[PATCH] USB: trivial error path fix

Trivial fix to USB class-creation error path; please apply.

Signed-off-by: Mark M. Hoffman <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/core/file.c

···
 
 	usb_class = class_create(THIS_MODULE, "usb");
 	if (IS_ERR(usb_class)) {
+		error = PTR_ERR(usb_class);
 		err("class_create failed for usb devices");
 		unregister_chrdev(USB_MAJOR, "usb");
 		goto out;