Update valueflow.cpp

Author: chrchr-github

lib/valueflow.cpp

@@ -6491,7 +6491,7 @@ static std::vector<ValueFlow::Value> getContainerSizeFromConstructorArgs(const s
             if (args.size() == 1 && args[0]->tokType() == Token::Type::eString)
                 return {makeContainerSizeValue(Token::getStrLength(args[0]), known)};
             if (args.size() == 1 && args[0]->variable() && args[0]->variable()->isArray() &&
-                args[0]->variable()->isConst() && args[0]->variable()->dimensions().size() == 1)
+                args[0]->variable()->isConst() && args[0]->variable()->dimensions().size() == 1 && args[0]->variable()->dimensions()[0].known)
                 return {makeContainerSizeValue(args[0]->variable()->dimensions()[0].num, known)};
             if (args.size() == 2 && astIsIntegral(args[1], false)) // { char*, count }
                 return {makeContainerSizeValue(args[1], known)};