Added some checks for self->state in the multi methods.
Added some checks for self->state in the multi methods.

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