[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/qlogicpti.c b/drivers/scsi/qlogicpti.c
index c7e78dc..00f4b84 100644
--- a/drivers/scsi/qlogicpti.c
+++ b/drivers/scsi/qlogicpti.c
@@ -132,7 +132,7 @@
 	PACKB(0, 0)	/* 0x0042 */
 };
 
-#define MAX_MBOX_COMMAND	(sizeof(mbox_param)/sizeof(u_short))
+#define MAX_MBOX_COMMAND	ARRAY_SIZE(mbox_param)
 
 /* queue length's _must_ be power of two: */
 #define QUEUE_DEPTH(in, out, ql)	((in - out) & (ql))