minor code cleanups in filters.cc
minor code cleanups in filters.cc

flavius/kakoune,rstacruz/kakoune,jjthrash/kakoune,lenormf/kakoune,danielma/kakoune,lenormf/kakoune,zakgreant/kakoune,rstacruz/kakoune,jkonecny12/kakoune,danielma/kakoune,alpha123/kakoune,mawww/kakoune,ekie/kakoune,jjthrash/kakoune,occivink/kakoune,alpha123/kakoune,zakgreant/kakoune,Somasis/kakoune,xificurC/kakoune,Asenar/kakoune,jkonecny12/kakoune,Somasis/kakoune,ekie/kakoune,elegios/kakoune,ekie/kakoune,alpha123/kakoune,Asenar/kakoune,alexherbo2/kakoune,ekie/kakoune,elegios/kakoune,danr/kakoune,mawww/kakoune,flavius/kakoune,casimir/kakoune,danielma/kakoune,xificurC/kakoune,danr/kakoune,mawww/kakoune,flavius/kakoune,danr/kakoune,xificurC/kakoune,jkonecny12/kakoune,rstacruz/kakoune,Somasis/kakoune,casimir/kakoune,zakgreant/kakoune,jkonecny12/kakoune,zakgreant/kakoune,rstacruz/kakoune,occivink/kakoune,alpha123/kakoune,elegios/kakoune,flavius/kakoune,Asenar/kakoune,elegios/kakoune,Asenar/kakoune,occivink/kakoune,danielma/kakoune,mawww/kakoune,Somasis/kakoune,occivink/kakoune,xificurC/kakoune,casimir/kakoune,alexherbo2/kakoune,alexherbo2/kakoune,lenormf/kakoune,casimir/kakoune,jjthrash/kakoune,jjthrash/kakoune,danr/kakoune,alexherbo2/kakoune,lenormf/kakoune