remove unless check

proxy/vmess/validator.go

@@ -156,11 +156,11 @@ func (v *TimedUserValidator) Remove(email string) bool {
 		return false
 	}
 	ulen := len(v.users)
-	if idx < ulen {
-		v.users[idx] = v.users[ulen-1]
-		v.users[ulen-1] = nil
-		v.users = v.users[:ulen-1]
-	}
+
+	v.users[idx] = v.users[ulen-1]
+	v.users[ulen-1] = nil
+	v.users = v.users[:ulen-1]
+
 	return true
 }