[SCSI] drivers/scsi: Use ARRAY_SIZE macro

Use ARRAY_SIZE macro instead of sizeof(x)/sizeof(x[0]) and remove
duplicates of the macro.

Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
index 9f75144..255421d 100644
--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -535,7 +535,7 @@
 	default:
 		data_dir = DMA_NONE;
 	}
-	if (user_srbcmd->sg.count > (sizeof(sg_list)/sizeof(sg_list[0]))) {
+	if (user_srbcmd->sg.count > ARRAY_SIZE(sg_list)) {
 		dprintk((KERN_DEBUG"aacraid: too many sg entries %d\n",
 		  le32_to_cpu(srbcmd->sg.count)));
 		rcode = -EINVAL;