fixed a minor bug in setNumThreads(int)
fixed a minor bug in setNumThreads(int)

kimwalisch/primesieve,anatoliyrazin/primesieve,anatoliyrazin/primesieve,ZahidDev/primesieve,tempbottle/primesieve,tempbottle/primesieve,fredwang00/primesieve,kimwalisch/primesieve,ZahidDev/primesieve,fredwang00/primesieve,anatoliyrazin/primesieve,fredwang00/primesieve,tempbottle/primesieve,kimwalisch/primesieve,ZahidDev/primesieve