Fix memory leaks - batch 3 (#6419)

src/V3Task.cpp

@@ -1706,6 +1706,7 @@ V3TaskConnects V3Task::taskConnects(AstNodeFTaskRef* nodep, AstNode* taskStmtsp,
                     pinp->v3error("Duplicate argument " << argp->prettyNameQ()
                                                         << " in function call to "
                                                         << nodep->taskp()->prettyTypeName());
+                    tconnects[it->second].second->unlinkFrBack()->deleteTree();
                 }
                 tconnects[it->second].second = argp;
                 reorganize = true;