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>

arch/arm/kernel/ecard.c

@@ -778,7 +778,7 @@ static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 
 static void ecard_proc_init(void)
 {
-	proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
+	proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
 	create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
 		get_ecard_dev_info);
 }