Thrift SSL server stops working if the file descriptor returned is zero

When the Thrift OpenSSL server gets a file descriptor of 0 (which is valid), the server stops working and cannot accept new connections because of the following code in TSSLSocket.cpp:

if (BIO_get_fd(bio, &fdSocket) <= 0)
{ throw TSSLException("BIO_get_fd failed"); }

The fix would be to just change the comparison from <= to <