switch kern_ipc_perm to umode_t

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/ipc.h b/include/linux/ipc.h
index 3b1594d..30e8161 100644
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -93,7 +93,7 @@
 	gid_t		gid;
 	uid_t		cuid;
 	gid_t		cgid;
-	mode_t		mode; 
+	umode_t		mode; 
 	unsigned long	seq;
 	void		*security;
 };