valueflow.cpp: avoid unnecessary copy in valueFlowLifetime()

Author: firewave

lib/valueflow.cpp

@@ -3426,10 +3426,10 @@ static void valueFlowLifetime(TokenList &tokenlist, ErrorLogger &errorLogger, co
         else if (tok->isUnaryOp("&")) {
             if (Token::simpleMatch(tok->astParent(), "*"))
                 continue;
-            for (const ValueFlow::LifetimeToken& lt : ValueFlow::getLifetimeTokens(tok->astOperand1(), settings)) {
+            for (ValueFlow::LifetimeToken& lt : ValueFlow::getLifetimeTokens(tok->astOperand1(), settings)) {
                 if (!settings.certainty.isEnabled(Certainty::inconclusive) && lt.inconclusive)
                     continue;
-                ErrorPath errorPath = lt.errorPath;
+                ErrorPath& errorPath = lt.errorPath;
                 errorPath.emplace_back(tok, "Address of variable taken here.");
 
                 ValueFlow::Value value;