modules/mappers/mod_negotiation.c:457: error: UNINITIALIZED_VALUE
  The value read from *end was never initialized.

modules/mappers/mod_negotiation.c:457:34: 
455.         /* Look for 'var = value' --- and make sure the var is in lcase. */
456. 
457.         for (cp = parm; (*cp && !apr_isspace(*cp) && *cp != '='); ++cp) {
                                      ^
458.             *cp = apr_tolower(*cp);
459.         }
