fixed another issue in the test case for the memory leak issue that was in receiveuntil().
fixed another issue in the test case for the memory leak issue that was in receiveuntil().

yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx