net/rpc: call client.Close() when test exit

Fixes #5768.

R=golang-dev
CC=golang-dev
https://golang.org/cl/10503043

src/pkg/net/rpc/server_test.go

@@ -125,6 +125,7 @@ func testRPC(t *testing.T, addr string) {
 	if err != nil {
 		t.Fatal("dialing", err)
 	}
+	defer client.Close()
 
 	// Synchronous calls
 	args := &Args{7, 8}
@@ -253,6 +254,7 @@ func testHTTPRPC(t *testing.T, path string) {
 	if err != nil {
 		t.Fatal("dialing", err)
 	}
+	defer client.Close()
 
 	// Synchronous calls
 	args := &Args{7, 8}
@@ -329,6 +331,7 @@ func TestServeRequest(t *testing.T) {
 
 func testServeRequest(t *testing.T, server *Server) {
 	client := CodecEmulator{server: server}
+	defer client.Close()
 
 	args := &Args{7, 8}
 	reply := new(Reply)
@@ -411,6 +414,7 @@ func (WriteFailCodec) Close() error {
 
 func TestSendDeadlock(t *testing.T) {
 	client := NewClientWithCodec(WriteFailCodec(0))
+	defer client.Close()
 
 	done := make(chan bool)
 	go func() {
@@ -449,6 +453,8 @@ func countMallocs(dial func() (*Client, error), t *testing.T) float64 {
 	if err != nil {
 		t.Fatal("error dialing", err)
 	}
+	defer client.Close()
+
 	args := &Args{7, 8}
 	reply := new(Reply)
 	return testing.AllocsPerRun(100, func() {
@@ -496,6 +502,8 @@ func (writeCrasher) Write(p []byte) (int, error) {
 func TestClientWriteError(t *testing.T) {
 	w := &writeCrasher{done: make(chan bool)}
 	c := NewClient(w)
+	defer c.Close()
+
 	res := false
 	err := c.Call("foo", 1, &res)
 	if err == nil {
@@ -552,6 +560,7 @@ func benchmarkEndToEnd(dial func() (*Client, error), b *testing.B) {
 	if err != nil {
 		b.Fatal("error dialing:", err)
 	}
+	defer client.Close()
 
 	// Synchronous calls
 	args := &Args{7, 8}
@@ -587,6 +596,7 @@ func benchmarkEndToEndAsync(dial func() (*Client, error), b *testing.B) {
 	if err != nil {
 		b.Fatal("error dialing:", err)
 	}
+	defer client.Close()
 
 	// Asynchronous calls
 	args := &Args{7, 8}