src/libpcp/src/auxconnect.c: guard against accept() returning an AF_UNSPEC connection
src/libpcp/src/auxconnect.c: guard against accept() returning an AF_UNSPEC connection

Only seen on Mac OS X to date, but we definitely see cases where pmcd
accepts connections but the socket's address family is undefined.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp