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/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index c8179fc..b97694f 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -855,7 +855,7 @@
 {
 	int rc;
 
-	ipl_kset = kset_create_and_add("ipl", NULL, &firmware_kset->kobj);
+	ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
 	if (!ipl_kset)
 		return -ENOMEM;
 	switch (ipl_info.type) {
@@ -974,7 +974,7 @@
 {
 	int rc;
 
-	reipl_kset = kset_create_and_add("reipl", NULL, &firmware_kset->kobj);
+	reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
 	if (!reipl_kset)
 		return -ENOMEM;
 	rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
@@ -1063,7 +1063,7 @@
 {
 	int rc;
 
-	dump_kset = kset_create_and_add("dump", NULL, &firmware_kset->kobj);
+	dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
 	if (!dump_kset)
 		return -ENOMEM;
 	rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr);
@@ -1086,7 +1086,7 @@
 	int rc;
 
 	shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
-						    &firmware_kset->kobj);
+						    firmware_kobj);
 	if (!shutdown_actions_kset)
 		return -ENOMEM;
 	rc = sysfs_create_file(&shutdown_actions_kset->kobj, &on_panic_attr);