mount: mount_info -- Drop unused @is_file

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/mount.h

@@ -57,7 +57,6 @@ struct mount_info {
 		bool		dumped;
 	};
 	bool			need_plugin;
-	int			is_file;
 	bool			is_ns_root;
 	struct mount_info	*next;
 	struct ns_id		*nsid;