Unsigned cast for EPOLLHUP bitwise AND `~EPOLLHUP` results in signed int, which makes the compiler throw on `events & ~EPOLLHUP`:
Unsigned cast for EPOLLHUP bitwise AND
`~EPOLLHUP` results in signed int, which makes the compiler throw on
`events & ~EPOLLHUP`:

```ash
error: implicit conversion changes signedness: 'int' to 'unsigned int'
      [-Werror,-Wsign-conversion]
```

This change make use of `static_cast<uint32_t>` to satisfy the compiler.

tijoytom/corefx,manu-silicon/corefx,seanshpark/corefx,ptoonen/corefx,rubo/corefx,krk/corefx,ellismg/corefx,gkhanna79/corefx,mmitche/corefx,axelheer/corefx,JosephTremoulet/corefx,ellismg/corefx,yizhang82/corefx,mokchhya/corefx,ericstj/corefx,Jiayili1/corefx,ptoonen/corefx,mokchhya/corefx,jhendrixMSFT/corefx,Petermarcu/corefx,shmao/corefx,axelheer/corefx,Ermiar/corefx,dotnet-bot/corefx,alexperovich/corefx,weltkante/corefx,ravimeda/corefx,Jiayili1/corefx,fgreinacher/corefx,ptoonen/corefx,cydhaselton/corefx,benpye/corefx,elijah6/corefx,YoupHulsebos/corefx,jcme/corefx,BrennanConroy/corefx,khdang/corefx,krk/corefx,Petermarcu/corefx,dsplaisted/corefx,tijoytom/corefx,cydhaselton/corefx,dotnet-bot/corefx,elijah6/corefx,stone-li/corefx,billwert/corefx,rjxby/corefx,jcme/corefx,jlin177/corefx,tstringer/corefx,jhendrixMSFT/corefx,alexperovich/corefx,shmao/corefx,twsouthwick/corefx,alexperovich/corefx,wtgodbe/corefx,mazong1123/corefx,mmitche/corefx,stone-li/corefx,ravimeda/corefx,Chrisboh/corefx,elijah6/corefx,manu-silicon/corefx,Priya91/corefx-1,JosephTremoulet/corefx,MaggieTsang/corefx,twsouthwick/corefx,rjxby/corefx,Ermiar/corefx,ravimeda/corefx,jcme/corefx,DnlHarvey/corefx,nbarbettini/corefx,billwert/corefx,the-dwyer/corefx,zhenlan/corefx,krk/corefx,yizhang82/corefx,marksmeltzer/corefx,axelheer/corefx,YoupHulsebos/corefx,khdang/corefx,dhoehna/corefx,alphonsekurian/corefx,stone-li/corefx,krytarowski/corefx,wtgodbe/corefx,jhendrixMSFT/corefx,Petermarcu/corefx,benjamin-bader/corefx,shimingsg/corefx,nbarbettini/corefx,manu-silicon/corefx,mmitche/corefx,rubo/corefx,JosephTremoulet/corefx,manu-silicon/corefx,seanshpark/corefx,SGuyGe/corefx,nbarbettini/corefx,jlin177/corefx,richlander/corefx,shmao/corefx,alphonsekurian/corefx,seanshpark/corefx,yizhang82/corefx,parjong/corefx,nchikanov/corefx,tstringer/corefx,Jiayili1/corefx,wtgodbe/corefx,richlander/corefx,benjamin-bader/corefx,twsouthwick/corefx,dsplaisted/corefx,iamjasonp/corefx,ravimeda/corefx,lggomez/corefx,twsouthwick/corefx,SGuyGe/corefx,Chrisboh/corefx,rahku/corefx,jlin177/corefx,rahku/corefx,Jiayili1/corefx,stephenmichaelf/corefx,cydhaselton/corefx,tstringer/corefx,manu-silicon/corefx,Ermiar/corefx,wtgodbe/corefx,Chrisboh/corefx,dhoehna/corefx,kkurni/corefx,Jiayili1/corefx,dotnet-bot/corefx,mazong1123/corefx,marksmeltzer/corefx,shahid-pk/corefx,yizhang82/corefx,mazong1123/corefx,jlin177/corefx,cydhaselton/corefx,cartermp/corefx,weltkante/corefx,shahid-pk/corefx,adamralph/corefx,fgreinacher/corefx,gkhanna79/corefx,Priya91/corefx-1,Priya91/corefx-1,jlin177/corefx,ptoonen/corefx,stephenmichaelf/corefx,zhenlan/corefx,MaggieTsang/corefx,nchikanov/corefx,ravimeda/corefx,krk/corefx,stephenmichaelf/corefx,tijoytom/corefx,the-dwyer/corefx,krk/corefx,ViktorHofer/corefx,wtgodbe/corefx,lggomez/corefx,rahku/corefx,DnlHarvey/corefx,shimingsg/corefx,YoupHulsebos/corefx,kkurni/corefx,adamralph/corefx,dhoehna/corefx,khdang/corefx,manu-silicon/corefx,Chrisboh/corefx,weltkante/corefx,pallavit/corefx,rjxby/corefx,mazong1123/corefx,ViktorHofer/corefx,nchikanov/corefx,billwert/corefx,alphonsekurian/corefx,dhoehna/corefx,MaggieTsang/corefx,pallavit/corefx,shmao/corefx,SGuyGe/corefx,Petermarcu/corefx,adamralph/corefx,alphonsekurian/corefx,YoupHulsebos/corefx,YoupHulsebos/corefx,nbarbettini/corefx,dhoehna/corefx,shimingsg/corefx,alphonsekurian/corefx,shimingsg/corefx,Chrisboh/corefx,ellismg/corefx,jcme/corefx,iamjasonp/corefx,ptoonen/corefx,ellismg/corefx,alphonsekurian/corefx,ViktorHofer/corefx,nbarbettini/corefx,pallavit/corefx,seanshpark/corefx,wtgodbe/corefx,axelheer/corefx,krytarowski/corefx,ViktorHofer/corefx,mmitche/corefx,cydhaselton/corefx,mmitche/corefx,SGuyGe/corefx,marksmeltzer/corefx,shmao/corefx,fgreinacher/corefx,dotnet-bot/corefx,shimingsg/corefx,dhoehna/corefx,cartermp/corefx,YoupHulsebos/corefx,twsouthwick/corefx,dsplaisted/corefx,weltkante/corefx,the-dwyer/corefx,jhendrixMSFT/corefx,tstringer/corefx,nchikanov/corefx,cydhaselton/corefx,kkurni/corefx,rubo/corefx,zhenlan/corefx,zhenlan/corefx,ericstj/corefx,jcme/corefx,gkhanna79/corefx,DnlHarvey/corefx,pallavit/corefx,tijoytom/corefx,cartermp/corefx,alexperovich/corefx,parjong/corefx,dotnet-bot/corefx,ptoonen/corefx,marksmeltzer/corefx,richlander/corefx,parjong/corefx,krytarowski/corefx,JosephTremoulet/corefx,pallavit/corefx,ericstj/corefx,iamjasonp/corefx,zhenlan/corefx,zhenlan/corefx,mokchhya/corefx,nchikanov/corefx,stone-li/corefx,benjamin-bader/corefx,benjamin-bader/corefx,nchikanov/corefx,Priya91/corefx-1,parjong/corefx,stone-li/corefx,benjamin-bader/corefx,jhendrixMSFT/corefx,cartermp/corefx,benpye/corefx,mmitche/corefx,twsouthwick/corefx,MaggieTsang/corefx,elijah6/corefx,seanshpark/corefx,zhenlan/corefx,gkhanna79/corefx,mazong1123/corefx,alexperovich/corefx,rahku/corefx,parjong/corefx,marksmeltzer/corefx,stone-li/corefx,dhoehna/corefx,jcme/corefx,iamjasonp/corefx,manu-silicon/corefx,the-dwyer/corefx,parjong/corefx,SGuyGe/corefx,ravimeda/corefx,krk/corefx,ViktorHofer/corefx,weltkante/corefx,twsouthwick/corefx,lggomez/corefx,DnlHarvey/corefx,richlander/corefx,khdang/corefx,Jiayili1/corefx,cydhaselton/corefx,tijoytom/corefx,Priya91/corefx-1,kkurni/corefx,the-dwyer/corefx,lggomez/corefx,alexperovich/corefx,lggomez/corefx,parjong/corefx,alexperovich/corefx,benjamin-bader/corefx,shmao/corefx,krytarowski/corefx,fgreinacher/corefx,tstringer/corefx,shahid-pk/corefx,rahku/corefx,gkhanna79/corefx,benpye/corefx,iamjasonp/corefx,yizhang82/corefx,mazong1123/corefx,richlander/corefx,stephenmichaelf/corefx,MaggieTsang/corefx,shimingsg/corefx,BrennanConroy/corefx,lggomez/corefx,shahid-pk/corefx,krk/corefx,ViktorHofer/corefx,elijah6/corefx,Ermiar/corefx,DnlHarvey/corefx,gkhanna79/corefx,yizhang82/corefx,iamjasonp/corefx,billwert/corefx,pallavit/corefx,stone-li/corefx,rjxby/corefx,ptoonen/corefx,JosephTremoulet/corefx,krytarowski/corefx,tstringer/corefx,mokchhya/corefx,elijah6/corefx,ericstj/corefx,billwert/corefx,khdang/corefx,seanshpark/corefx,yizhang82/corefx,ravimeda/corefx,shimingsg/corefx,JosephTremoulet/corefx,axelheer/corefx,shmao/corefx,the-dwyer/corefx,ViktorHofer/corefx,krytarowski/corefx,mazong1123/corefx,mokchhya/corefx,ericstj/corefx,benpye/corefx,shahid-pk/corefx,gkhanna79/corefx,khdang/corefx,tijoytom/corefx,jhendrixMSFT/corefx,krytarowski/corefx,MaggieTsang/corefx,billwert/corefx,weltkante/corefx,Petermarcu/corefx,nchikanov/corefx,tijoytom/corefx,benpye/corefx,rubo/corefx,the-dwyer/corefx,DnlHarvey/corefx,dotnet-bot/corefx,Ermiar/corefx,jlin177/corefx,YoupHulsebos/corefx,seanshpark/corefx,ellismg/corefx,Jiayili1/corefx,lggomez/corefx,rjxby/corefx,kkurni/corefx,jhendrixMSFT/corefx,wtgodbe/corefx,richlander/corefx,mmitche/corefx,Ermiar/corefx,stephenmichaelf/corefx,JosephTremoulet/corefx,jlin177/corefx,cartermp/corefx,dotnet-bot/corefx,weltkante/corefx,cartermp/corefx,Petermarcu/corefx,Petermarcu/corefx,alphonsekurian/corefx,stephenmichaelf/corefx,ellismg/corefx,billwert/corefx,MaggieTsang/corefx,ericstj/corefx,richlander/corefx,axelheer/corefx,SGuyGe/corefx,marksmeltzer/corefx,benpye/corefx,iamjasonp/corefx,nbarbettini/corefx,shahid-pk/corefx,rahku/corefx,elijah6/corefx,Priya91/corefx-1,mokchhya/corefx,Ermiar/corefx,Chrisboh/corefx,kkurni/corefx,nbarbettini/corefx,rahku/corefx,marksmeltzer/corefx,rjxby/corefx,rjxby/corefx,stephenmichaelf/corefx,DnlHarvey/corefx,rubo/corefx,BrennanConroy/corefx,ericstj/corefx