config: update size information

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/blockdev.c b/util-linux/blockdev.c
index e53ade99..5d8e465 100644
--- a/util-linux/blockdev.c
+++ b/util-linux/blockdev.c
@@ -6,7 +6,7 @@
  * Licensed under GPLv2, see file LICENSE in this source tree.
  */
 //config:config BLOCKDEV
-//config:	bool "blockdev (2.4 kb)"
+//config:	bool "blockdev (2.3 kb)"
 //config:	default y
 //config:	help
 //config:	Performs some ioctls with block devices.