[SCSI] aic79xx: convert to use the data buffer accessors

- remove the unnecessary map_single path.

- convert to use the new accessors for the sg lists and the
parameters.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.h b/drivers/scsi/aic7xxx/aic79xx_osm.h
index ad9761b..853998b 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.h
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.h
@@ -781,7 +781,7 @@
 static __inline
 void ahd_set_residual(struct scb *scb, u_long resid)
 {
-	scb->io_ctx->resid = resid;
+	scsi_set_resid(scb->io_ctx, resid);
 }
 
 static __inline
@@ -793,7 +793,7 @@
 static __inline
 u_long ahd_get_residual(struct scb *scb)
 {
-	return (scb->io_ctx->resid);
+	return scsi_get_resid(scb->io_ctx);
 }
 
 static __inline