Copy CPL_ERROR_SEPARATOR value

Author: geographika

port/cpl_error.cpp

@@ -1024,6 +1024,7 @@ void CPL_STDCALL CPLDefaultErrorHandler(CPLErr eErrClass, CPLErrorNum nError,
             // is considered as failing the job. This is rarely the intended
             // behavior
             pszErrorSeparator = CPLGetConfigOption("CPL_ERROR_SEPARATOR", ":");
+            pszErrorSeparator = CPLStrdup(pszSep);
         }
 
         nCount++;