[Fix] Change expiration logic for redis_cache

Noticed by: @jeremy

diff --git a/lualib/redis_scripts/bayes_cache_learn.lua b/lualib/redis_scripts/bayes_cache_learn.lua
index 8811f3c3358042e5e117adcdecc95f1bebb42afe..4185e574169fd0e91618373f1096bff2cbd464a8 100644 (file)
--- a/lualib/redis_scripts/bayes_cache_learn.lua
+++ b/lualib/redis_scripts/bayes_cache_learn.lua
@@ -43,7 +43,7 @@ if not added then
     local exists = redis.call('EXISTS', prefix)
 
     if exists then
-      if expired then
+      if not expired then
         redis.call('DEL', prefix)
         redis.call('HSET', prefix, cache_id, is_spam)