-lf_check_file(int fd, uschar *filename, int s_type, int modemask, uid_t *owners,
- gid_t *owngroups, char *type, uschar **errmsg)
+lf_check_file(int fd, const uschar * filename, int s_type, int modemask,
+ uid_t * owners, gid_t * owngroups, const char * type, uschar ** errmsg)