Fix possible memory leak with software_16.
Fix possible memory leak with software_16.

If image data is not loaded at all, engine must free associated 32 bit
structure.


git-svn-id: de1cbd220ac9a29ed59a7cc342d87cbce0beeb96@32781 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

antognolli/Evas,antognolli/Evas,antognolli/Evas,antognolli/Evas