iommufd/device: Fix hwpt at err_unresv in iommufd_device_do_replace()

The rewind routine should remove the reserved iovas added to the new hwpt.

Fixes: 89db316 ("iommufd: Derive iommufd_hwpt_paging from iommufd_hw_pagetable")
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/r/20240718050130.1956804-1-nicolinc@nvidia.com
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
(cherry picked from commit 950aeef)
Signed-off-by: Koba Ko <kobak@nvidia.com>

Author: nicolinc

drivers/iommu/iommufd/device.c

@@ -542,7 +542,7 @@ iommufd_device_do_replace(struct iommufd_device *idev,
 err_unresv:
 	if (hwpt_is_paging(hwpt))
 		iommufd_group_remove_reserved_iova(igroup,
-						   to_hwpt_paging(old_hwpt));
+						   to_hwpt_paging(hwpt));
 err_unlock:
 	mutex_unlock(&idev->igroup->lock);
 	return ERR_PTR(rc);