In 09ea2ca8 we fixed a memset(), but it turns out wiping memory at that
position is wrong in the first place:
If an ase mesh has a GEOMOBJECT/NODE_TM transform matrix before the
GEOMOBJECT/MESH entry, the prior parsed TM will be wiped.
Since a GEOMOBJECT aseObject_t is already calling memset() upon
initialisation, we can just drop the spurios call.
Fixes#13.