MCE-18274_port_fs_loader check error warned by lint

Author: smashleon23

canal/fsloader.go

@@ -48,7 +48,10 @@ func (l *fsInfoLoader) Save(addr, name string, position uint32, force bool) erro
 pos: pos,
 }
 
-e.Encode(m)
+enc_err := e.Encode(m)
+if enc_err != nil {
+log.Errorf("canal save master info to file %s err %v", l.path, enc_err)
+}
 
 var err error
 if err = ioutil2.WriteFileAtomic(l.path, buf.Bytes(), 0644); err != nil {