Version of OpenTTD

master

Expected result

Gamelog loaded correctly

Actual result

In SlGamelogAction::Load LoggedAction::changes is never assigned in the non IsSavegameVersionBefore(SLV_RIFF_TO_ARRAY) path.
LoggedChange items are loaded into LoggedAction::change beyond the logical (but not allocated) end of the array.
When the Gamelog is cleared, pointers referenced by LoggedChange items are leaked, which is how the issue was noticed.

Steps to reproduce

Load a savegame with a version >= SLV_RIFF_TO_ARRAY (294).
Run the gamelog command or otherwise observe the gamelog.