pipe/fifo: Remove unused members from rst structures

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

fifo.c

@@ -28,9 +28,6 @@ struct fifo_info {
 	struct list_head	list;
 	struct file_desc	d;
 	struct fifo_entry	*fe;
-
-	u32			bytes;
-	off_t			off;
 	bool			restore_data;
 };
 

pipes.c

@@ -24,8 +24,6 @@ struct pipe_info {
 	struct list_head	list;		/* list head for fdinfo_list_entry-s */
 	struct file_desc	d;
 	int			create;
-	int			bytes;
-	off_t			off;
 };
 
 static LIST_HEAD(pipes);