mount: Drop useless NULL assignment

We allocate mount_info with xzalloc, no need for
additional NULL assignment.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

mount.c

@@ -1098,7 +1098,6 @@ struct mount_info *mnt_entry_alloc()
 		INIT_LIST_HEAD(&new->mnt_share);
 		INIT_LIST_HEAD(&new->mnt_bind);
 		INIT_LIST_HEAD(&new->postpone);
-		new->mnt_master = NULL;
 	}
 	return new;
 }