optimize: header_filter_by_lua*: removed a piece of useless code. thanks Zi Lin for the report.

Author: agentzh

src/ngx_http_lua_headerfilterby.c

@@ -28,10 +28,6 @@
 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
 
 
-/* light user data key for the "ngx" table in the Lua VM regsitry */
-static char ngx_http_lua_headerfilterby_ngx_key;
-
-
 /**
  * Set environment table for the given code closure.
  *
@@ -64,12 +60,6 @@ ngx_http_lua_header_filter_by_lua_env(lua_State *L, ngx_http_request_t *r)
      * */
     ngx_http_lua_create_new_globals_table(L, 0 /* narr */, 1 /* nrec */);
 
-    /*  {{{ initialize ngx.* namespace */
-    lua_pushlightuserdata(L, &ngx_http_lua_headerfilterby_ngx_key);
-    lua_rawget(L, LUA_REGISTRYINDEX);
-    lua_setfield(L, -2, "ngx");
-    /*  }}} */
-
     /*  {{{ make new env inheriting main thread's globals table */
     lua_createtable(L, 0, 1 /* nrec */);   /* the metatable for the new env */
     ngx_http_lua_get_globals_table(L);