Fw: tds_write_packet returns FAIL

tds_write_packet() returns TDS_FAIL if zero bytes were written, but
it's not an error to send a zero-length query.  

I think the return statement below should be 

	return sent < 0 ? TDS_FAIL : TDS_SUCCEED;

but maybe I'm missing something? 


tds_write_packet(TDSSOCKET * tds, unsigned char final)
...
	sent = tds_goodwrite(tds, tds->out_buf, 
				tds->out_pos, final);
...
	return sent <= 0 ? TDS_FAIL : TDS_SUCCEED;