Fixed a typo

dlib/svm/structural_svm_problem.h

@@ -453,7 +453,7 @@ namespace dlib
                 {
                     converged = true;
                     skip_cache = false;
-                    return (current_risk_gap < std::max(cache_based_eps,cache_based_eps*current_risk_value));
+                    return (current_risk_gap < std::max(cache_based_eps,cache_based_eps*current_risk_value)) ||
                            (current_risk_gap == 0);
                 }