Cosmetic fixes in port.go.

This closes #5 on GitHub.
From 615369a29511c6021e5623070f082fdb17ff37a2

src/go/unit/port.go

@@ -134,7 +134,10 @@ func nxt_go_port_send(pid C.int, id C.int, buf unsafe.Pointer, buf_size C.int,
 
 	p := find_port(key)
 
-	if p != nil {
+	if p == nil {
+		return 0
+	}
+
 	n, oobn, err := p.snd.WriteMsgUnix(C.GoBytes(buf, buf_size),
 		C.GoBytes(oob, oob_size), nil)
 
@@ -143,9 +146,7 @@ func nxt_go_port_send(pid C.int, id C.int, buf unsafe.Pointer, buf_size C.int,
 	}
 
 	return C.int(n)
-	}
 
-	return 0
 }
 
 //export nxt_go_main_send
@@ -154,7 +155,10 @@ func nxt_go_main_send(buf unsafe.Pointer, buf_size C.int, oob unsafe.Pointer,
 
 	p := main_port()
 
-	if p != nil {
+	if p == nil {
+		return 0
+	}
+
 	n, oobn, err := p.snd.WriteMsgUnix(C.GoBytes(buf, buf_size),
 		C.GoBytes(oob, oob_size), nil)
 
@@ -165,9 +169,6 @@ func nxt_go_main_send(buf unsafe.Pointer, buf_size C.int, oob unsafe.Pointer,
 	return C.int(n)
 }
 
-	return 0
-}
-
 func new_port(pid int, id int, t int, rcv int, snd int) *port {
 	p := &port{
 		key: port_key{
@@ -200,7 +201,9 @@ func (p *port) read(handler http.Handler) error {
 
 	if c_req == 0 {
 		m.Close()
-	} else {
+		return nil
+	}
+
 	r := find_request(c_req)
 
 	go func(r *request) {
@@ -219,7 +222,6 @@ func (p *port) read(handler http.Handler) error {
 	} else {
 		m.Close()
 	}
-	}
 
-	return err
+	return nil
 }