apparmor:match_mn() - constify devpath argument

Signed-off-by: Al Viro <[e-mail]>

security/apparmor/mount.c

···
  * Returns: 0 on success else error
  */
 static int match_mnt(struct aa_profile *profile, const struct path *path,
-		     char *buffer, struct path *devpath, char *devbuffer,
+		     char *buffer, const struct path *devpath, char *devbuffer,
 		     const char *type, unsigned long flags, void *data,
 		     bool binary)
 {
···
 	return error;
 }
 
-static int profile_umount(struct aa_profile *profile, struct path *path,
+static int profile_umount(struct aa_profile *profile, const struct path *path,
 			  char *buffer)
 {
 	struct aa_perms perms = { };