IB/uverbs: Delete type and id from uverbs_obj_attr

In this context the uobject is not allowed to be NULL, so type is the same
as uobject->type, and at least for IDR, id is the same as uobject->id.

FD objects should never handle the FD number outside the uAPI boundary
code.
Suggested-by: Guy Levi <guyle@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/uverbs_ioctl.c

@@ -152,14 +152,12 @@ static int uverbs_process_attr(struct ib_device *ibdev,
 		object = uverbs_get_object(ibdev, spec->obj.obj_type);
 		if (!object)
 			return -EINVAL;
-		o_attr->type = object->type_attrs;
 
-		o_attr->id = (int)uattr->data;
 		o_attr->uobject = uverbs_get_uobject_from_context(
-					o_attr->type,
+					object->type_attrs,
 					ucontext,
 					spec->obj.access,
-					o_attr->id);
+					(int)uattr->data);
 
 		if (IS_ERR(o_attr->uobject))
 			return PTR_ERR(o_attr->uobject);

include/rdma/uverbs_ioctl.h

@@ -344,11 +344,7 @@ struct uverbs_ptr_attr {
 };
 
 struct uverbs_obj_attr {
-	/* pointer to the kernel descriptor -> type, access, etc */
-	const struct uverbs_obj_type	*type;
 	struct ib_uobject		*uobject;
-	/* fd or id in idr of this object */
-	int				id;
 };
 
 struct uverbs_attr {