sal_uInt16 to size_t, remove unneeded downcast
sal_uInt16 to size_t, remove unneeded downcast

Change-Id: I48689ad3a974d5bc2386766b55045e4456a0d72c

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