NbtkTable: Fix some bugs in non-homogeneous allocate
NbtkTable: Fix some bugs in non-homogeneous allocate

pwithnall/mx,jonnylamb/mx,clutter-project/mx,clutter-project/mx,clutter-project/mx,jonnylamb/mx,pwithnall/mx,pwithnall/mx,pwithnall/mx,clutter-project/mx,jonnylamb/mx,jonnylamb/mx