net: fix incorrect mode on ListenIP, ListenUDP

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5523044

src/pkg/net/iprawsock_posix.go

@@ -260,7 +260,7 @@ func ListenIP(netProto string, laddr *IPAddr) (c *IPConn, err error) {
 	default:
 		return nil, UnknownNetworkError(net)
 	}
-	fd, e := internetSocket(net, laddr.toAddr(), nil, syscall.SOCK_RAW, proto, "dial", sockaddrToIP)
+	fd, e := internetSocket(net, laddr.toAddr(), nil, syscall.SOCK_RAW, proto, "listen", sockaddrToIP)
 	if e != nil {
 		return nil, e
 	}

src/pkg/net/udpsock_posix.go

@@ -233,7 +233,7 @@ func ListenUDP(net string, laddr *UDPAddr) (c *UDPConn, err error) {
 	if laddr == nil {
 		return nil, &OpError{"listen", "udp", nil, errMissingAddress}
 	}
-	fd, e := internetSocket(net, laddr.toAddr(), nil, syscall.SOCK_DGRAM, 0, "dial", sockaddrToUDP)
+	fd, e := internetSocket(net, laddr.toAddr(), nil, syscall.SOCK_DGRAM, 0, "listen", sockaddrToUDP)
 	if e != nil {
 		return nil, e
 	}