[net processing] Fixup MaybeDiscourageAndDisconnect() style
[net processing] Fixup MaybeDiscourageAndDisconnect() style

Based on review comments from Marco Falke and Jon Atack.

GroestlCoin/bitcoin,achow101/bitcoin,litecoin-project/litecoin,instagibbs/bitcoin,sipsorcery/bitcoin,MeshCollider/bitcoin,bitcoinsSG/bitcoin,namecoin/namecoin-core,namecoin/namecoin-core,lateminer/bitcoin,domob1812/namecore,andreaskern/bitcoin,anditto/bitcoin,domob1812/namecore,particl/particl-core,AkioNak/bitcoin,bitcoinknots/bitcoin,rnicoll/dogecoin,namecoin/namecoin-core,particl/particl-core,alecalve/bitcoin,anditto/bitcoin,fujicoin/fujicoin,ElementsProject/elements,pataquets/namecoin-core,Sjors/bitcoin,pataquets/namecoin-core,rnicoll/bitcoin,practicalswift/bitcoin,andreaskern/bitcoin,JeremyRubin/bitcoin,sipsorcery/bitcoin,AkioNak/bitcoin,pstratem/bitcoin,MeshCollider/bitcoin,alecalve/bitcoin,GroestlCoin/GroestlCoin,MarcoFalke/bitcoin,achow101/bitcoin,fujicoin/fujicoin,domob1812/bitcoin,fujicoin/fujicoin,jambolo/bitcoin,sipsorcery/bitcoin,rnicoll/dogecoin,bitcoinsSG/bitcoin,particl/particl-core,Xekyo/bitcoin,jlopp/statoshi,instagibbs/bitcoin,EthanHeilman/bitcoin,mm-s/bitcoin,rnicoll/bitcoin,mm-s/bitcoin,bitcoin/bitcoin,instagibbs/bitcoin,practicalswift/bitcoin,EthanHeilman/bitcoin,jlopp/statoshi,rnicoll/bitcoin,litecoin-project/litecoin,rnicoll/dogecoin,JeremyRubin/bitcoin,qtumproject/qtum,dscotese/bitcoin,namecoin/namecoin-core,practicalswift/bitcoin,qtumproject/qtum,GroestlCoin/bitcoin,GroestlCoin/bitcoin,kallewoof/bitcoin,Sjors/bitcoin,jnewbery/bitcoin,bitcoinknots/bitcoin,mruddy/bitcoin,n1bor/bitcoin,kallewoof/bitcoin,tecnovert/particl-core,pstratem/bitcoin,MarcoFalke/bitcoin,achow101/bitcoin,namecoin/namecore,apoelstra/bitcoin,jamesob/bitcoin,mruddy/bitcoin,cdecker/bitcoin,mruddy/bitcoin,MarcoFalke/bitcoin,lateminer/bitcoin,fanquake/bitcoin,yenliangl/bitcoin,mruddy/bitcoin,kallewoof/bitcoin,domob1812/namecore,cdecker/bitcoin,apoelstra/bitcoin,namecoin/namecore,anditto/bitcoin,ElementsProject/elements,practicalswift/bitcoin,mm-s/bitcoin,n1bor/bitcoin,ajtowns/bitcoin,prusnak/bitcoin,litecoin-project/litecoin,kallewoof/bitcoin,ajtowns/bitcoin,alecalve/bitcoin,jlopp/statoshi,tecnovert/particl-core,jnewbery/bitcoin,jlopp/statoshi,EthanHeilman/bitcoin,kallewoof/bitcoin,jonasschnelli/bitcoin,pataquets/namecoin-core,lateminer/bitcoin,qtumproject/qtum,Sjors/bitcoin,sipsorcery/bitcoin,jambolo/bitcoin,fanquake/bitcoin,Xekyo/bitcoin,JeremyRubin/bitcoin,GroestlCoin/GroestlCoin,GroestlCoin/bitcoin,bitcoin/bitcoin,prusnak/bitcoin,ajtowns/bitcoin,AkioNak/bitcoin,practicalswift/bitcoin,n1bor/bitcoin,MeshCollider/bitcoin,bitcoin/bitcoin,sstone/bitcoin,dscotese/bitcoin,MeshCollider/bitcoin,apoelstra/bitcoin,dscotese/bitcoin,bitcoinknots/bitcoin,Xekyo/bitcoin,AkioNak/bitcoin,Xekyo/bitcoin,sstone/bitcoin,instagibbs/bitcoin,alecalve/bitcoin,jamesob/bitcoin,andreaskern/bitcoin,prusnak/bitcoin,cdecker/bitcoin,cdecker/bitcoin,jonasschnelli/bitcoin,MarcoFalke/bitcoin,anditto/bitcoin,pstratem/bitcoin,JeremyRubin/bitcoin,pataquets/namecoin-core,GroestlCoin/GroestlCoin,domob1812/bitcoin,cdecker/bitcoin,jonasschnelli/bitcoin,MarcoFalke/bitcoin,sstone/bitcoin,sstone/bitcoin,namecoin/namecoin-core,rnicoll/bitcoin,mruddy/bitcoin,litecoin-project/litecoin,ElementsProject/elements,qtumproject/qtum,achow101/bitcoin,achow101/bitcoin,n1bor/bitcoin,fanquake/bitcoin,apoelstra/bitcoin,rnicoll/bitcoin,MeshCollider/bitcoin,sipsorcery/bitcoin,andreaskern/bitcoin,anditto/bitcoin,namecoin/namecore,pstratem/bitcoin,sstone/bitcoin,JeremyRubin/bitcoin,particl/particl-core,GroestlCoin/bitcoin,domob1812/bitcoin,domob1812/namecore,mruddy/bitcoin,ajtowns/bitcoin,rnicoll/dogecoin,jamesob/bitcoin,ElementsProject/elements,bitcoinsSG/bitcoin,jamesob/bitcoin,instagibbs/bitcoin,namecoin/namecore,jamesob/bitcoin,rnicoll/bitcoin,kallewoof/bitcoin,bitcoinsSG/bitcoin,bitcoin/bitcoin,cdecker/bitcoin,Sjors/bitcoin,Xekyo/bitcoin,particl/particl-core,pstratem/bitcoin,yenliangl/bitcoin,ajtowns/bitcoin,particl/particl-core,tecnovert/particl-core,practicalswift/bitcoin,qtumproject/qtum,fanquake/bitcoin,namecoin/namecoin-core,qtumproject/qtum,namecoin/namecore,litecoin-project/litecoin,jonasschnelli/bitcoin,anditto/bitcoin,EthanHeilman/bitcoin,dscotese/bitcoin,pataquets/namecoin-core,domob1812/namecore,n1bor/bitcoin,andreaskern/bitcoin,lateminer/bitcoin,prusnak/bitcoin,bitcoin/bitcoin,n1bor/bitcoin,AkioNak/bitcoin,bitcoinknots/bitcoin,fujicoin/fujicoin,domob1812/bitcoin,dscotese/bitcoin,tecnovert/particl-core,EthanHeilman/bitcoin,EthanHeilman/bitcoin,bitcoin/bitcoin,achow101/bitcoin,AkioNak/bitcoin,ElementsProject/elements,pataquets/namecoin-core,pstratem/bitcoin,tecnovert/particl-core,yenliangl/bitcoin,prusnak/bitcoin,bitcoinsSG/bitcoin,mm-s/bitcoin,alecalve/bitcoin,instagibbs/bitcoin,GroestlCoin/GroestlCoin,jnewbery/bitcoin,domob1812/namecore,qtumproject/qtum,JeremyRubin/bitcoin,bitcoinknots/bitcoin,sstone/bitcoin,jnewbery/bitcoin,jamesob/bitcoin,lateminer/bitcoin,domob1812/bitcoin,apoelstra/bitcoin,fanquake/bitcoin,Sjors/bitcoin,jambolo/bitcoin,MeshCollider/bitcoin,lateminer/bitcoin,jlopp/statoshi,jambolo/bitcoin,jambolo/bitcoin,fanquake/bitcoin,alecalve/bitcoin,ajtowns/bitcoin,Xekyo/bitcoin,bitcoinsSG/bitcoin,rnicoll/dogecoin,mm-s/bitcoin,ElementsProject/elements,yenliangl/bitcoin,jambolo/bitcoin,tecnovert/particl-core,MarcoFalke/bitcoin,sipsorcery/bitcoin,GroestlCoin/GroestlCoin,fujicoin/fujicoin,jonasschnelli/bitcoin,fujicoin/fujicoin,litecoin-project/litecoin,GroestlCoin/bitcoin,mm-s/bitcoin,GroestlCoin/GroestlCoin,yenliangl/bitcoin,prusnak/bitcoin,andreaskern/bitcoin,jlopp/statoshi,namecoin/namecore,dscotese/bitcoin,jnewbery/bitcoin,domob1812/bitcoin,yenliangl/bitcoin,apoelstra/bitcoin