[client] buf fix. remote compiler's stdout/stderr should not print when failed.
[client] buf fix. remote compiler's stdout/stderr should not print when failed.

check 'http response code' and 'remote compiler's exit code' in advance

jason-hwang/secc,ivere27/secc,osmanager/secc,ivere27/secc,jason-hwang/secc,osmanager/secc,jason-hwang/secc,osmanager/secc,ivere27/secc