airo: correct proc entry creation interfaces

* use proc_mkdir_mode() instead of create_proc_entry(S_IFDIR|...),
  export proc_mkdir_mode() for that, oh well.
* don't supply S_IFREG to proc_create_data(), it's unnecessary

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

fs/proc/generic.c

@@ -674,6 +674,7 @@ struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode,
 	}
 	return ent;
 }
+EXPORT_SYMBOL(proc_mkdir_mode);
 
 struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
 		struct proc_dir_entry *parent)