remove "struct subsystem" as it is no longer needed

We need to work on cleaning up the relationship between kobjects, ksets and
ktypes.  The removal of 'struct subsystem' is the first step of this,
especially as it is not really needed at all.

Thanks to Kay for fixing the bugs in this patch.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

fs/ocfs2/cluster/masklog.h

@@ -278,7 +278,7 @@ extern struct mlog_bits mlog_and_bits, mlog_not_bits;
 
 #include <linux/kobject.h>
 #include <linux/sysfs.h>
-int mlog_sys_init(struct subsystem *o2cb_subsys);
+int mlog_sys_init(struct kset *o2cb_subsys);
 void mlog_sys_shutdown(void);
 
 #endif /* O2CLUSTER_MASKLOG_H */