driver core: fix small mem leak in driver_add_kobj()

The Coverity checker spotted that we leak the storage allocated to 'name' in
int driver_add_kobj(). The leak looks legit to me - this is the code :

int driver_add_kobj(struct device_driver *drv, struct kobject *kobj,
const char *fmt, ...)
{
va_list args;
char *name;
int ret;

va_start(args, fmt);
name = kvasprintf(GFP_KERNEL, fmt, args);
^^^^^^^^ This dynamically allocates space...

va_end(args);

if (!name)
return -ENOMEM;

return kobject_add(kobj, &drv->p->kobj, "%s", name);
^^^^^^^^ This neglects to free the space allocated
}

Inside kobject_add() a copy of 'name' will be made and used. As far as I can
see, Coverity is correct in flagging this as a leak, but I'd like some
configmation before the patch is applied.

This should fix it.

Signed-off-by: Jesper Juhl <[e-mail]>
Cc: Greg KH <[e-mail]>
Cc: Kay Sievers <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/base/driver.c

···
 {
 	va_list args;
 	char *name;
+	int ret;
 
 	va_start(args, fmt);
 	name = kvasprintf(GFP_KERNEL, fmt, args);
···
 	if (!name)
 		return -ENOMEM;
 
-	return kobject_add(kobj, &drv->p->kobj, "%s", name);
+	ret = kobject_add(kobj, &drv->p->kobj, "%s", name);
+	kfree(name);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(driver_add_kobj);