fix lints: declaration of "err" shadows declaration at io.go:11

settings/io.go

@@ -9,13 +9,13 @@ import (
 // Stream return a byte stream of a given file
 func (s Settings) Stream(file string) ([]byte, error) {
 	_, err := os.Stat(file)
-	if err == nil {
+	if err != nil {
+		return nil, err
+	}
 	content, err := ioutil.ReadFile(file)
 	s.Validate(err)
 	return content, err
 }
-	return nil, err
-}
 
 // Write a file given a name and a byte stream
 func (s Settings) Write(name string, data []byte) error {