Fix assert having wrong condition

tools/python/src/global_optimization.cpp

@@ -60,7 +60,7 @@ double call_func(py::object f, const matrix<double,0,1>& args)
     const auto num = num_function_arguments(f, args.size());
     DLIB_CASSERT(num == args.size(), 
         "The function being optimized takes a number of arguments that doesn't agree with the size of the bounds lists you provided to find_max_global()");
-    DLIB_CASSERT(0 < num && num < 35, "Functions being optimized must take between 1 and 35 scalar arguments.");
+    DLIB_CASSERT(0 < num && num <= 35, "Functions being optimized must take between 1 and 35 scalar arguments.");
 
 #define CALL_WITH_N_ARGS(N) case N: return dlib::gopt_impl::_cwv(f,args,typename make_compile_time_integer_range<N>::type()).cast<double>(); 
     switch (num)