Assert that typelib_typedescription_release will not destroy pTDR->pType
Assert that typelib_typedescription_release will not destroy pTDR->pType

...which is dereferenced a few lines further down; this is in preparation for a
commit addressing cid#440589.

Change-Id: I3428216258d928473f85ecd4d025c352c8c83ea0

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core