- remove check for max_fd < 0 in curl_multi_fdset since max_fd == -1 indicates an empty fd set
- remove check for max_fd < 0 in curl_multi_fdset since max_fd == -1 indicates
an empty fd set

m13253/pycurl-python3,jcharum/pycurl,ninemoreminutes/pycurl,jcharum/pycurl,jcharum/pycurl,ninemoreminutes/pycurl,m13253/pycurl-python3,m13253/pycurl-python3,ninemoreminutes/pycurl,ninemoreminutes/pycurl