driver core: remove KOBJ_NAME_LEN define

Kobjects do not have a limit in name size since a while, so stop
pretending that they do.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/device.h b/include/linux/device.h
index 0e1d24c..fba1bb0 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -29,8 +29,7 @@
 /* DEVICE_NAME_HALF is really less than half to accommodate slop */
 #define DEVICE_NAME_HALF	__stringify(20)
 #define DEVICE_ID_SIZE		32
-#define BUS_ID_SIZE		KOBJ_NAME_LEN
-
+#define BUS_ID_SIZE		20
 
 struct device;
 struct device_driver;