Function PrepareOldDiffCustom

src/saveload/settings_sl.cpp:26–29

* Prepare for reading and old diff_custom by zero-ing the memory. */

 * Prepare for reading and old diff_custom by zero-ing the memory.
 */
void PrepareOldDiffCustom()
{
	_old_diff_custom.fill(0);
}

/**
 * Reading of the old diff_custom array and transforming it to the new format.