firmware: change firmware_kset to firmware_kobj

There is no firmware "subsystem" it's just a directory in /sys that
other portions of the kernel want to hook into.  So make it a kobject
not a kset to help alivate anyone who tries to do some odd kset-like
things with this.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/firmware/edd.c b/drivers/firmware/edd.c
index f07f370..ddcc957 100644
--- a/drivers/firmware/edd.c
+++ b/drivers/firmware/edd.c
@@ -756,7 +756,7 @@
 		return 1;
 	}
 
-	edd_kset = kset_create_and_add("edd", NULL, &firmware_kset->kobj);
+	edd_kset = kset_create_and_add("edd", NULL, firmware_kobj);
 	if (!edd_kset)
 		return -ENOMEM;