errcheck; sort some stuff out

rpc/lib/client/http_client.go

@@ -93,7 +93,7 @@ func (c *JSONRPCClient) Call(method string, params map[string]interface{}, resul
 	if err != nil {
 		return nil, err
 	}
-	defer httpResponse.Body.Close() // nolint (errcheck)
+	defer httpResponse.Body.Close() // nolint: errcheck
 
 	responseBytes, err := ioutil.ReadAll(httpResponse.Body)
 	if err != nil {
@@ -129,7 +129,7 @@ func (c *URIClient) Call(method string, params map[string]interface{}, result in
 	if err != nil {
 		return nil, err
 	}
-	defer resp.Body.Close() // nolint (errcheck)
+	defer resp.Body.Close() // nolint: errcheck
 
 	responseBytes, err := ioutil.ReadAll(resp.Body)
 	if err != nil {

rpc/lib/client/ws_client.go

@@ -354,7 +354,7 @@ func (c *WSClient) writeRoutine() {
 		ticker.Stop()
 		if err := c.conn.Close(); err != nil {
 			// ignore error; it will trigger in tests
-			// likely because it's closing and already closed connection
+			// likely because it's closing an already closed connection
 		}
 		c.wg.Done()
 	}()
@@ -406,7 +406,7 @@ func (c *WSClient) readRoutine() {
 	defer func() {
 		if err := c.conn.Close(); err != nil {
 			// ignore error; it will trigger in tests
-			// likely because it's closing and already closed connection
+			// likely because it's closing an already closed connection
 		}
 		c.wg.Done()
 	}()

rpc/lib/client/ws_client_test.go

@@ -34,11 +34,7 @@ func (h *myHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if err != nil {
 		panic(err)
 	}
-	defer func() {
-		if err := conn.Close(); err != nil {
-			panic(err)
-		}
-	}()
+	defer conn.Close() // nolint: errcheck
 	for {
 		messageType, _, err := conn.ReadMessage()
 		if err != nil {