proc: remove proc_bus

Remove proc_bus export and variable itself. Using pathnames works fine
and is slightly more understandable and greppable.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/nubus/proc.c b/drivers/nubus/proc.c
index e07492b..cb83ace 100644
--- a/drivers/nubus/proc.c
+++ b/drivers/nubus/proc.c
@@ -171,7 +171,7 @@
 {
 	if (!MACH_IS_MAC)
 		return;
-	proc_bus_nubus_dir = proc_mkdir("nubus", proc_bus);
+	proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL);
 	create_proc_info_entry("devices", 0, proc_bus_nubus_dir,
 				get_nubus_dev_info);
 	proc_bus_nubus_add_devices();