oox: use proper integer type when calling PK11_DigestFinal
oox: use proper integer type when calling PK11_DigestFinal

Change-Id: I5ff79c55446bd9f3e350fb128793ffef51be843f

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