[NET]: all net/ cleanup with ARRAY_SIZE

Signed-off-by: Denis Cheng <crquan@gmail.com>
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index ddfd2af..fa24614 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -150,7 +150,7 @@
 }
 };
 
-#define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
+#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
 
 #define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))