fix gocyclo warnings (#278)

core/mapping/utils.go

@@ -153,9 +153,11 @@ func doParseKeyAndOptions(field reflect.StructField, value string) (string, *fie
 	key := strings.TrimSpace(segments[0])
 	options := segments[1:]
 
-	if len(options) > 0 {
-		var fieldOpts fieldOptions
+	if len(options) == 0 {
+		return key, nil, nil
+	}
 
+	var fieldOpts fieldOptions
 	for _, segment := range options {
 		option := strings.TrimSpace(segment)
 		switch {
@@ -204,9 +206,6 @@ func doParseKeyAndOptions(field reflect.StructField, value string) (string, *fie
 	return key, &fieldOpts, nil
 }
 
-	return key, nil, nil
-}
-
 func implicitValueRequiredStruct(tag string, tp reflect.Type) (bool, error) {
 	numFields := tp.NumField()
 	for i := 0; i < numFields; i++ {