Remove unused variables
Remove unused variables

ldap_mapper.c:842:15: warning: unused variable `i' [-Wunused-variable]
  unsigned int i;
               ^
ldap_mapper.c:841:35: warning: unused variable `der_len' [-Wunused-variable]
  size_t buf_len, user_filter_len, der_len;
                                   ^
ldap_mapper.c:840:17: warning: unused variable `der' [-Wunused-variable]
  unsigned char *der;
                 ^

OpenSC/pam_pkcs11,OpenSC/pam_pkcs11,milgner/pam_pkcs11,milgner/pam_pkcs11,milgner/pam_pkcs11