xen_auto_xlat_grant_frames.vaddr is definitely NULL in this case.
So the address printing is unnecessary.
Signed-off-by: NFuqian Huang <huangfq.daxian@gmail.com>
Reviewed-by: NJuergen Gross <jgross@suse.com>
Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>