consitify do_mount() arguments

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c
index fe00cdf..390c646 100644
--- a/security/tomoyo/mount.c
+++ b/security/tomoyo/mount.c
@@ -71,7 +71,8 @@
  *
  * Caller holds tomoyo_read_lock().
  */
-static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
+static int tomoyo_mount_acl(struct tomoyo_request_info *r,
+			    const char *dev_name,
 			    struct path *dir, const char *type,
 			    unsigned long flags)
 {
@@ -183,7 +184,7 @@
  *
  * Returns 0 on success, negative value otherwise.
  */
-int tomoyo_mount_permission(char *dev_name, struct path *path,
+int tomoyo_mount_permission(const char *dev_name, struct path *path,
 			    const char *type, unsigned long flags,
 			    void *data_page)
 {