[BLOCK] Get rid of request_queue_t typedef

Some of the code has been gradually transitioned to using the proper
struct request_queue, but there's lots left. So do a full sweet of
the kernel and get rid of this typedef and replace its uses with
the proper type.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index 5826508..ceffa60 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -202,7 +202,7 @@
 #define ATAPI_WRITE_10		0x2a
 
 static int pf_open(struct inode *inode, struct file *file);
-static void do_pf_request(request_queue_t * q);
+static void do_pf_request(struct request_queue * q);
 static int pf_ioctl(struct inode *inode, struct file *file,
 		    unsigned int cmd, unsigned long arg);
 static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo);
@@ -760,7 +760,7 @@
 	}
 }
 
-static void do_pf_request(request_queue_t * q)
+static void do_pf_request(struct request_queue * q)
 {
 	if (pf_busy)
 		return;