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>
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index f1281339..f1637f1 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -674,6 +674,7 @@
 	}
 	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)