Revert "synchronized with lua-nginx-module #09484e8 (do not mutate another module's main_conf)."

This reverts commit 40b124e.

Also reverted in
openresty/lua-nginx-module@c2390ab.

See details at:

    openresty/lua-nginx-module#1627

Author: thibaultcha

src/subsys/ngx_subsys_lua_initworkerby.c.tt2

@@ -108,6 +108,7 @@ ngx_[% subsys %]_lua_init_worker(ngx_cycle_t *cycle)
 
     conf_ctx = (ngx_[% subsys %]_conf_ctx_t *)
                cycle->conf_ctx[ngx_[% subsys %]_module.index];
+    [% subsys %]_ctx.main_conf = conf_ctx->main_conf;
 
 [% IF http_subsys %]
     top_clcf = conf_ctx->loc_conf[ngx_http_core_module.ctx_index];
@@ -231,12 +232,6 @@ ngx_[% subsys %]_lua_init_worker(ngx_cycle_t *cycle)
         return NGX_ERROR;
     }
 
-    [% subsys %]_ctx.main_conf = ngx_pcalloc(conf.pool,
-                                             sizeof(void *) * ngx_[% subsys %]_max_module);
-    if ([% subsys %]_ctx.main_conf == NULL) {
-        return NGX_ERROR;
-    }
-
 #if defined(nginx_version) && nginx_version >= 1009011
     modules = cycle->modules;
 #else
@@ -250,21 +245,6 @@ ngx_[% subsys %]_lua_init_worker(ngx_cycle_t *cycle)
 
         module = modules[i]->ctx;
 
-        if (module->create_main_conf) {
-            cur = module->create_main_conf(&conf);
-            if (cur == NULL) {
-                return NGX_ERROR;
-            }
-
-            if (ngx_modules[i]->index == ngx_[% subsys %]_lua_module.index) {
-                ngx_memcpy(cur,
-                           conf_ctx->main_conf[ngx_[% subsys %]_lua_module.ctx_index],
-                           sizeof(ngx_[% subsys %]_lua_main_conf_t));
-            }
-
-            [% subsys %]_ctx.main_conf[modules[i]->ctx_index] = cur;
-        }
-
         if (module->create_srv_conf) {
             cur = module->create_srv_conf(&conf);
             if (cur == NULL) {