valueflow.cpp: avoid unnecessary copy in valueFlowLifetime()

Author: firewave

lib/valueflow.cpp

@@ -3006,10 +3006,10 @@ static void valueFlowLifetime(TokenList &tokenlist, ErrorLogger &errorLogger, co
                 if (tok2 && tok2 != op1 && (!tok2->variable() || !tok2->variable()->isArray()) && !(tok2->valueType() && tok2->valueType()->container))
                     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;