consitify do_mount() arguments

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index d88eb3a..a2ee362 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -408,8 +408,8 @@
  *
  * Returns 0 on success, negative value otherwise.
  */
-static int tomoyo_sb_mount(char *dev_name, struct path *path,
-			   char *type, unsigned long flags, void *data)
+static int tomoyo_sb_mount(const char *dev_name, struct path *path,
+			   const char *type, unsigned long flags, void *data)
 {
 	return tomoyo_mount_permission(dev_name, path, type, flags, data);
 }