coverity#1264390 try and help coverity out wrt Bad bit shift operation
coverity#1264390 try and help coverity out wrt Bad bit shift operation

nBitCount can only be <=8 if aHeader.nBitCount <= 8, hopefully using
aHeader.nBitCount here will make it clear to coverity that aHeader.nBitCount
cannot be more than 31 and thus silence that warning

Change-Id: Ie195ab55cafb9a967c1face8070089e040b242fa

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