detect/lua: Unregister Lua object on free

This commit ensures that the LUA object is unregistered when the Lua
object is freed.

src/detect-lua.c

@@ -687,6 +687,7 @@ static DetectLuaData *DetectLuaParse (const DetectEngineCtx *de_ctx, const char
         goto error;
     }
 
+    lua->de_ctx = de_ctx;
     return lua;
 
 error:
@@ -1119,6 +1120,10 @@ static void DetectLuaFree(void *ptr)
         if (lua->filename)
             SCFree(lua->filename);
 
+        if (lua->de_ctx) {
+            DetectUnregisterThreadCtxFuncs((DetectEngineCtx *)lua->de_ctx, NULL, lua, "lua");
+        }
+
         SCFree(lua);
     }
 }

src/detect-lua.h

@@ -49,6 +49,8 @@ typedef struct DetectLuaData {
     uint32_t sid;
     uint32_t rev;
     uint32_t gid;
+
+    const DetectEngineCtx *de_ctx;
 } DetectLuaData;
 
 #endif /* HAVE_LUA */