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/spi/spi.h b/include/linux/spi/spi.h
index 387e428..b9a76c9 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -733,7 +733,7 @@
 	 * controller_data goes to spi_device.controller_data,
 	 * irq is copied too
 	 */
-	char		modalias[KOBJ_NAME_LEN];
+	char		modalias[32];
 	const void	*platform_data;
 	void		*controller_data;
 	int		irq;