Rem: delete fk log and check error

LICENSE

@@ -176,7 +176,7 @@
 
    END OF TERMS AND CONDITIONS
 
-   Copyright 2016 ~ 2017 Alex Stocks.
+   Copyright 2016 ~ 2018 Alex Stocks.
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

session.go

@@ -320,13 +320,12 @@ func (s *session) WritePkg(pkg interface{}, timeout time.Duration) error {
 
 	var err error
 	if timeout <= 0 {
-		if err = s.writer.Write(s, pkg); err == nil {
+		if err = s.writer.Write(s, pkg); err != nil {
 			s.incWritePkgNum()
 			gxlog.CError("after incWritePkgNum, ss:%s", s.Stat())
 		}
 		return err
 	}
-	gxlog.CError("fk")
 	select {
 	case s.wQ <- pkg:
 		break // for possible gen a new pkg