all: simplify variable initialization

If we assign the variable after declaring it, we can simplify it using
":=" operator or "= value".
The reader can still known the type of variable from the struct name or
variable type before assignment operator.

client_test.go

@@ -72,9 +72,7 @@ func TestClientRedirectSameSchema(t *testing.T) {
 		return
 	}
 
-	var reqClient *HostClient
-
-	reqClient = &HostClient{
+	reqClient := &HostClient{
 		IsTLS: true,
 		Addr:  urlParsed.Host,
 		TLSConfig: &tls.Config{
@@ -117,9 +115,7 @@ func TestClientRedirectChangingSchemaHttp2Https(t *testing.T) {
 		return
 	}
 
-	var reqClient *HostClient
-
-	reqClient = &HostClient{
+	reqClient := &HostClient{
 		Addr: urlParsed.Host,
 		TLSConfig: &tls.Config{
 			InsecureSkipVerify: true,

server.go

@@ -1986,8 +1986,7 @@ func (s *Server) serveConn(c net.Conn) error {
 		}
 
 		if hijackHandler != nil {
-			var hjr io.Reader
-			hjr = c
+			var hjr io.Reader = c
 			if br != nil {
 				hjr = br
 				br = nil