chore: update unauthorized callback calling order (#1469)

* chore: update unauthorized callback calling order

* chore: add comments

core/limit/tokenlimit.go

@@ -112,7 +112,8 @@ func (lim *TokenLimiter) reserveN(now time.Time, n int) bool {
 	// Lua boolean false -> r Nil bulk reply
 	if err == redis.Nil {
 		return false
-	} else if err != nil {
+	}
+	if err != nil {
 		logx.Errorf("fail to use rate limiter: %s, use in-process limiter for rescue", err)
 		lim.startMonitor()
 		return lim.rescueLimiter.AllowN(now, n)

core/mapping/unmarshaler.go

@@ -742,7 +742,9 @@ func getValueWithChainedKeys(m Valuer, keys []string) (interface{}, bool) {
 	if len(keys) == 1 {
 		v, ok := m.Value(keys[0])
 		return v, ok
-	} else if len(keys) > 1 {
+	}
+
+	if len(keys) > 1 {
 		if v, ok := m.Value(keys[0]); ok {
 			if nextm, ok := v.(map[string]interface{}); ok {
 				return getValueWithChainedKeys(MapValuer(nextm), keys[1:])