remove an assert from an attempt to silence clang's false warning
remove an assert from an attempt to silence clang's false warning

http://llvm.org/bugs/show_bug.cgi?id=12459
It is not clear to me why the explicit cast was there in the first
place, but removing it probably can't make the situation worse
than aborting incorrectly.

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