Revert the changes from r23383 for m68k/n68kadd.pas. Memo to self: Don't change code if you don't really understand why it does things the way it does.

With this change and the change from r23465 we are down from ~950 to ~650 failures :D


git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23466 3ad0048d-3df7-0310-abae-a5850022a9f2