Actually increment the counter when adding rule nodes to the free list.
Actually increment the counter when adding rule nodes to the free list.

MozReview-Commit-ID: 1uipYlIF8fv

saneyuki/servo,notriddle/servo,DominoTree/servo,rnestler/servo,DominoTree/servo,jimberlage/servo,nnethercote/servo,splav/servo,SimonSapin/servo,dati91/servo,sadmansk/servo,splav/servo,pyfisch/servo,KiChjang/servo,szeged/servo,saneyuki/servo,thiagopnts/servo,ConnorGBrewster/servo,avadacatavra/servo,dati91/servo,canaltinova/servo,fiji-flo/servo,upsuper/servo,cbrewster/servo,upsuper/servo,pyfisch/servo,dati91/servo,SimonSapin/servo,szeged/servo,jimberlage/servo,larsbergstrom/servo,paulrouget/servo,fiji-flo/servo,DominoTree/servo,avadacatavra/servo,avadacatavra/servo,splav/servo,dsandeephegde/servo,upsuper/servo,rnestler/servo,ConnorGBrewster/servo,mattnenterprise/servo,dsandeephegde/servo,peterjoel/servo,saneyuki/servo,anthgur/servo,fiji-flo/servo,mbrubeck/servo,SimonSapin/servo,KiChjang/servo,mattnenterprise/servo,avadacatavra/servo,thiagopnts/servo,notriddle/servo,dsandeephegde/servo,KiChjang/servo,emilio/servo,pyfisch/servo,larsbergstrom/servo,emilio/servo,anthgur/servo,paulrouget/servo,thiagopnts/servo,notriddle/servo,larsbergstrom/servo,CJ8664/servo,emilio/servo,SimonSapin/servo,dsandeephegde/servo,peterjoel/servo,avadacatavra/servo,anthgur/servo,pyfisch/servo,nnethercote/servo,mbrubeck/servo,dsandeephegde/servo,KiChjang/servo,SimonSapin/servo,rnestler/servo,eddyb/servo,splav/servo,KiChjang/servo,dati91/servo,splav/servo,eddyb/servo,mattnenterprise/servo,rnestler/servo,canaltinova/servo,paulrouget/servo,CJ8664/servo,thiagopnts/servo,SimonSapin/servo,thiagopnts/servo,mattnenterprise/servo,saneyuki/servo,mbrubeck/servo,sadmansk/servo,mattnenterprise/servo,szeged/servo,splav/servo,saneyuki/servo,emilio/servo,SimonSapin/servo,splav/servo,pyfisch/servo,mattnenterprise/servo,peterjoel/servo,fiji-flo/servo,jimberlage/servo,nnethercote/servo,upsuper/servo,KiChjang/servo,DominoTree/servo,mbrubeck/servo,notriddle/servo,szeged/servo,ConnorGBrewster/servo,thiagopnts/servo,eddyb/servo,emilio/servo,dsandeephegde/servo,fiji-flo/servo,saneyuki/servo,CJ8664/servo,sadmansk/servo,eddyb/servo,canaltinova/servo,pyfisch/servo,pyfisch/servo,nnethercote/servo,anthgur/servo,szeged/servo,fiji-flo/servo,rnestler/servo,emilio/servo,cbrewster/servo,upsuper/servo,paulrouget/servo,saneyuki/servo,peterjoel/servo,avadacatavra/servo,nnethercote/servo,notriddle/servo,szeged/servo,canaltinova/servo,paulrouget/servo,pyfisch/servo,DominoTree/servo,szeged/servo,avadacatavra/servo,mbrubeck/servo,eddyb/servo,peterjoel/servo,sadmansk/servo,paulrouget/servo,anthgur/servo,peterjoel/servo,ConnorGBrewster/servo,cbrewster/servo,fiji-flo/servo,larsbergstrom/servo,DominoTree/servo,paulrouget/servo,upsuper/servo,notriddle/servo,nnethercote/servo,larsbergstrom/servo,anthgur/servo,dati91/servo,CJ8664/servo,dati91/servo,mbrubeck/servo,jimberlage/servo,szeged/servo,saneyuki/servo,peterjoel/servo,nnethercote/servo,anthgur/servo,jimberlage/servo,rnestler/servo,anthgur/servo,szeged/servo,canaltinova/servo,SimonSapin/servo,jimberlage/servo,paulrouget/servo,larsbergstrom/servo,canaltinova/servo,mbrubeck/servo,KiChjang/servo,larsbergstrom/servo,splav/servo,cbrewster/servo,sadmansk/servo,thiagopnts/servo,CJ8664/servo,ConnorGBrewster/servo,DominoTree/servo,dsandeephegde/servo,sadmansk/servo,emilio/servo,larsbergstrom/servo,notriddle/servo,saneyuki/servo,KiChjang/servo,dati91/servo,fiji-flo/servo,splav/servo,larsbergstrom/servo,eddyb/servo,larsbergstrom/servo,saneyuki/servo,paulrouget/servo,splav/servo,dsandeephegde/servo,notriddle/servo,eddyb/servo,cbrewster/servo,canaltinova/servo,jimberlage/servo,peterjoel/servo,DominoTree/servo,thiagopnts/servo,cbrewster/servo,dati91/servo,DominoTree/servo,nnethercote/servo,CJ8664/servo,jimberlage/servo,sadmansk/servo,pyfisch/servo,szeged/servo,emilio/servo,ConnorGBrewster/servo,canaltinova/servo,ConnorGBrewster/servo,emilio/servo,mbrubeck/servo,avadacatavra/servo,eddyb/servo,peterjoel/servo,DominoTree/servo,CJ8664/servo,paulrouget/servo,notriddle/servo,emilio/servo,upsuper/servo,ConnorGBrewster/servo,cbrewster/servo,CJ8664/servo,rnestler/servo,pyfisch/servo,upsuper/servo,sadmansk/servo,rnestler/servo,nnethercote/servo,nnethercote/servo,jimberlage/servo,KiChjang/servo,KiChjang/servo,notriddle/servo,cbrewster/servo,mattnenterprise/servo,peterjoel/servo,mattnenterprise/servo