Merge pull request #11 from jbenet/fix/nil-addr

return error if passed nil net.Addr

convert.go

@@ -13,6 +13,10 @@ var errIncorrectNetAddr = fmt.Errorf("incorrect network addr conversion")
 
 // FromNetAddr converts a net.Addr type to a Multiaddr.
 func FromNetAddr(a net.Addr) (ma.Multiaddr, error) {
+	if a == nil {
+		return nil, fmt.Errorf("nil multiaddr")
+	}
+
 	switch a.Network() {
 	case "tcp", "tcp4", "tcp6":
 		ac, ok := a.(*net.TCPAddr)