block: cciss: use ARRAY_SIZE

Change sizeof(x) / sizeof(*x) to ARRAY_SIZE(x).

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Acked-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 51ceaee..e1e7143 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -335,7 +335,7 @@
 static const char *raid_label[] = { "0", "4", "1(1+0)", "5", "5+1", "ADG",
 	"UNKNOWN"
 };
-#define RAID_UNKNOWN (sizeof(raid_label) / sizeof(raid_label[0])-1)
+#define RAID_UNKNOWN (ARRAY_SIZE(raid_label)-1)
 
 #ifdef CONFIG_PROC_FS