Fix an off-by-one error with limits.max_vertex_attribs
Fix an off-by-one error with limits.max_vertex_attribs

ConnorGBrewster/servo,mattnenterprise/servo,pyfisch/servo,sadmansk/servo,ConnorGBrewster/servo,szeged/servo,szeged/servo,anthgur/servo,cbrewster/servo,dati91/servo,paulrouget/servo,saneyuki/servo,saneyuki/servo,avadacatavra/servo,anthgur/servo,notriddle/servo,KiChjang/servo,mbrubeck/servo,KiChjang/servo,nnethercote/servo,SimonSapin/servo,emilio/servo,anthgur/servo,notriddle/servo,splav/servo,DominoTree/servo,mbrubeck/servo,szeged/servo,nnethercote/servo,emilio/servo,emilio/servo,emilio/servo,canaltinova/servo,KiChjang/servo,nnethercote/servo,peterjoel/servo,larsbergstrom/servo,pyfisch/servo,canaltinova/servo,mattnenterprise/servo,mattnenterprise/servo,sadmansk/servo,cbrewster/servo,saneyuki/servo,SimonSapin/servo,KiChjang/servo,peterjoel/servo,jimberlage/servo,notriddle/servo,jimberlage/servo,paulrouget/servo,peterjoel/servo,canaltinova/servo,upsuper/servo,avadacatavra/servo,szeged/servo,szeged/servo,jimberlage/servo,pyfisch/servo,KiChjang/servo,DominoTree/servo,jimberlage/servo,dati91/servo,mbrubeck/servo,peterjoel/servo,upsuper/servo,splav/servo,SimonSapin/servo,mattnenterprise/servo,larsbergstrom/servo,splav/servo,avadacatavra/servo,KiChjang/servo,saneyuki/servo,emilio/servo,szeged/servo,paulrouget/servo,pyfisch/servo,jimberlage/servo,canaltinova/servo,mbrubeck/servo,dati91/servo,mattnenterprise/servo,mbrubeck/servo,mbrubeck/servo,anthgur/servo,upsuper/servo,larsbergstrom/servo,KiChjang/servo,dati91/servo,larsbergstrom/servo,cbrewster/servo,notriddle/servo,upsuper/servo,paulrouget/servo,KiChjang/servo,szeged/servo,nnethercote/servo,upsuper/servo,mbrubeck/servo,SimonSapin/servo,ConnorGBrewster/servo,emilio/servo,sadmansk/servo,sadmansk/servo,cbrewster/servo,splav/servo,upsuper/servo,paulrouget/servo,SimonSapin/servo,szeged/servo,paulrouget/servo,notriddle/servo,nnethercote/servo,paulrouget/servo,sadmansk/servo,notriddle/servo,emilio/servo,saneyuki/servo,mattnenterprise/servo,SimonSapin/servo,ConnorGBrewster/servo,notriddle/servo,pyfisch/servo,peterjoel/servo,avadacatavra/servo,saneyuki/servo,splav/servo,anthgur/servo,nnethercote/servo,ConnorGBrewster/servo,emilio/servo,peterjoel/servo,dati91/servo,upsuper/servo,larsbergstrom/servo,larsbergstrom/servo,KiChjang/servo,DominoTree/servo,mbrubeck/servo,KiChjang/servo,paulrouget/servo,cbrewster/servo,pyfisch/servo,ConnorGBrewster/servo,emilio/servo,mattnenterprise/servo,jimberlage/servo,anthgur/servo,cbrewster/servo,canaltinova/servo,paulrouget/servo,sadmansk/servo,peterjoel/servo,dati91/servo,szeged/servo,szeged/servo,avadacatavra/servo,canaltinova/servo,larsbergstrom/servo,pyfisch/servo,nnethercote/servo,dati91/servo,larsbergstrom/servo,DominoTree/servo,jimberlage/servo,saneyuki/servo,paulrouget/servo,emilio/servo,upsuper/servo,sadmansk/servo,splav/servo,avadacatavra/servo,DominoTree/servo,splav/servo,ConnorGBrewster/servo,cbrewster/servo,mattnenterprise/servo,anthgur/servo,larsbergstrom/servo,nnethercote/servo,saneyuki/servo,DominoTree/servo,larsbergstrom/servo,splav/servo,canaltinova/servo,avadacatavra/servo,avadacatavra/servo,SimonSapin/servo,splav/servo,notriddle/servo,canaltinova/servo,cbrewster/servo,pyfisch/servo,jimberlage/servo,notriddle/servo,SimonSapin/servo,jimberlage/servo,nnethercote/servo,DominoTree/servo,peterjoel/servo,peterjoel/servo,anthgur/servo,peterjoel/servo,DominoTree/servo,pyfisch/servo,notriddle/servo,dati91/servo,nnethercote/servo,splav/servo,DominoTree/servo,saneyuki/servo,DominoTree/servo,saneyuki/servo,pyfisch/servo,sadmansk/servo,ConnorGBrewster/servo