make golint happy

config/config.go

@@ -113,7 +113,6 @@ func NewConfigData(adapterName string, data []byte) (Configer, error) {
 // 0, 0.0, f, F, FALSE, false, False, NO, no, No, N,n, OFF, off, Off.
 // Any other value returns an error.
 func ParseBool(val interface{}) (value bool, err error) {
-
 	if val != nil {
 		switch v := val.(type) {
 		case bool:
@@ -140,7 +139,6 @@ func ParseBool(val interface{}) (value bool, err error) {
 			}
 		}
 		return false, fmt.Errorf("parsing %q: invalid syntax", val)
-	} else {
-		return false, fmt.Errorf("parsing <nil>: invalid syntax")
 	}
+	return false, fmt.Errorf("parsing <nil>: invalid syntax")
 }

config/xml/xml.go

@@ -94,9 +94,8 @@ type ConfigContainer struct {
 func (c *ConfigContainer) Bool(key string) (bool, error) {
 	if v, ok := c.data[key]; ok {
 		return config.ParseBool(v)
-	} else {
-		return false, fmt.Errorf("not exist key: %q", key)
 	}
+	return false, fmt.Errorf("not exist key: %q", key)
 }
 
 // DefaultBool return the bool value if has no error

config/yaml/yaml.go

@@ -123,9 +123,8 @@ type ConfigContainer struct {
 func (c *ConfigContainer) Bool(key string) (bool, error) {
 	if v, ok := c.data[key]; ok {
 		return config.ParseBool(v)
-	} else {
-		return false, fmt.Errorf("not exist key: %q", key)
 	}
+	return false, fmt.Errorf("not exist key: %q", key)
 }
 
 // DefaultBool return the bool value if has no error