Fix call to assimp.aiReleaseImport(), scene pointer was passed in incorrectly

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@565 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

port/PyAssimp/pyassimp/pyassimp.py

@@ -194,7 +194,8 @@ def load(filename, processing=0):
     return model.contents._init()
 
 def release(scene):
-    _assimp_lib.release(scene)
+    from ctypes import pointer
+    _assimp_lib.release(pointer(scene))
     
 def aiGetMaterialFloatArray(material, key):
     AI_SUCCESS = 0