Change !BLI_ghashIterator_isDone to BLI_ghashIterator_notDone. It is
always used in that context so we can at least avoid reverting it twice
:p.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55083 954f8c5b-7b00-dc11-b283-0030488c597c