valueflow.cpp: added some early outs in ConditionHandler::beforeCondition() [skip ci]

Author: firewave

lib/valueflow.cpp

@@ -4811,19 +4811,23 @@ struct ConditionHandler {
                 return;
             }
 
+            if (cond.true_values.empty() && cond.false_values.empty())
+                return;
+
             std::list<ValueFlow::Value> values = cond.true_values;
             if (cond.true_values != cond.false_values)
                 values.insert(values.end(), cond.false_values.cbegin(), cond.false_values.cend());
 
             // extra logic for unsigned variables 'i>=1' => possible value can also be 0
             if (Token::Match(tok, "<|>|<=|>=")) {
+                if (cond.vartok->valueType() && cond.vartok->valueType()->sign != ValueType::Sign::UNSIGNED)
+                    return;
+
                 values.remove_if([](const ValueFlow::Value& v) {
                     if (v.isIntValue())
                         return v.intvalue != 0;
                     return false;
                 });
-                if (cond.vartok->valueType() && cond.vartok->valueType()->sign != ValueType::Sign::UNSIGNED)
-                    return;
             }
             if (values.empty())
                 return;