switch debugfs to umode_t

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/x86/xen/debugfs.h b/arch/x86/xen/debugfs.h
index e281320..78d2549 100644
--- a/arch/x86/xen/debugfs.h
+++ b/arch/x86/xen/debugfs.h
@@ -3,7 +3,7 @@
 
 struct dentry * __init xen_init_debugfs(void);
 
-struct dentry *xen_debugfs_create_u32_array(const char *name, mode_t mode,
+struct dentry *xen_debugfs_create_u32_array(const char *name, umode_t mode,
 					    struct dentry *parent,
 					    u32 *array, unsigned elements);