LMail: do not use main_L

The fenv cache was allocated on the wrong lua_State.

debian/changelog

@@ -2,6 +2,7 @@ cm4all-qrelay (0.26) unstable; urgency=low
 
   * lua: remove deprecated method "mail:get_cgroup()"
   * lua: close Lua file descriptors when connection is closed
+  * lua: fix broken cgroup xattr access
 
  --   
 

src/Connection.cxx

@@ -79,7 +79,7 @@ QmqpRelayConnection::OnRequest(AllocatedArray<std::byte> &&payload)
 
 	handler->Push(L);
 
-	NewLuaMail(L, GetMainState(), auto_close,
+	NewLuaMail(L, auto_close,
 		   std::move(mail), peer_cred);
 
 	Resume(L, 1);

src/LMail.cxx

@@ -359,11 +359,11 @@ RegisterLuaMail(lua_State *L)
 }
 
 MutableMail *
-NewLuaMail(lua_State *L, lua_State *main_L,
+NewLuaMail(lua_State *L,
 	   Lua::AutoCloseList &auto_close,
 	   MutableMail &&src, const struct ucred &peer_cred)
 {
-	return LuaMail::New(L, main_L, auto_close, std::move(src), peer_cred);
+	return LuaMail::New(L, L, auto_close, std::move(src), peer_cred);
 }
 
 MutableMail &

src/LMail.hxx

@@ -15,11 +15,9 @@ RegisterLuaMail(lua_State *L);
 
 /**
  * @param L the lua_State on whose stack the new object will be pushed
- * @param main_L the lua_State which is used to destruct Lua values
- * owned by the new object
  */
 MutableMail *
-NewLuaMail(lua_State *L, lua_State *main_L,
+NewLuaMail(lua_State *L,
 	   Lua::AutoCloseList &auto_close,
 	   MutableMail &&src, const struct ucred &peer_cred);