add addr_stob() check for AF_UNSPEC netmask sockaddrs
add addr_stob() check for AF_UNSPEC netmask sockaddrs

jncornett/libdnet,wtfbbqhax/libdnet,wtfbbqhax/libdnet,kbandla/libdnet,wtfbbqhax/libdnet,kbandla/libdnet,kbandla/libdnet,jncornett/libdnet,jncornett/libdnet