loop.h build fix

include/linux/loop.h:66: error: expected specifier-qualifier-list before 'request_queue_t'

Cc: Sebastian Siewior <sebastian@breakpoint.cc>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/loop.h

@@ -63,7 +63,7 @@ struct loop_device {
 	struct task_struct	*lo_thread;
 	wait_queue_head_t	lo_event;
 
-	request_queue_t		*lo_queue;
+	struct request_queue	*lo_queue;
 	struct gendisk		*lo_disk;
 	struct list_head	lo_list;
 };