Evas render: Remove useless code

Evas render: Remove useless code

While invesigating some clip & map issues, I found some very
strange piece of code:
{
  tmp = a;
  a = c;
  a = tmp;
}

This actually comes from a very old code refactoring where a
line in-between was removed:

   tobj = obj->cur.map_parent;
   obj->cur.map_parent = obj->cur.clipper->cur.map_parent;
 - evas_object_clip_recalc(obj);
   obj->cur.map_parent = tobj;

Adding this line back there doesn't seem to do anything anyways.
So, let's just remove useless code.

For the record (legacy evas):
  commit e1f6f3c5f239dfd95a307949acd5f98831c0c3c0
  Date:   Fri Aug 17 06:16:04 2012 +0000
  evas/render - code refactoring.
  SVN revision: 75351