[SCSI] remove scsi_request infrastructure

With Achim patch the last user (gdth) is switched away from scsi_request
so we an kill it now.  Also disables some code in i2o_scsi that was
broken since the sg driver stopped using scsi_requests.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index fc4d9f6..76071a1 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -716,8 +716,8 @@
 {
     TRACE2(("gdth_scsi_done()\n"));
 
-    if (scp->sc_request)
-        complete((struct completion *)scp->sc_request);
+    if (scp->request)
+        complete((struct completion *)scp->request);
 }
 
 int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd, char *cmnd,
@@ -732,8 +732,8 @@
         return -ENOMEM;
     memset(scp, 0, sizeof(*scp));
     scp->device = sdev;
-    /* use sc_request field to save the ptr. to completion struct. */
-    scp->sc_request = (struct scsi_request *)&wait;
+    /* use request field to save the ptr. to completion struct. */
+    scp->request = (struct request *)&wait;
     scp->timeout_per_command = timeout*HZ;
     scp->request_buffer = gdtcmd;
     scp->cmd_len = 12;