Fixed conversion issue.

src/core/math/ParserOMP.cpp

@@ -51,7 +51,7 @@ void FunctionParserOMP::parse(const std::string & eq)
    #ifdef _OPENMP
    #pragma omp parallel for schedule(static)
    #endif
-   for (uint_t t = 0; t < omp_get_max_threads(); ++t)
+   for (uint_t t = 0; t < uint_c( omp_get_max_threads() ); ++t)
    {
       parser_[t].parse(eq);
    }