fix decref before incref on buffer item assignments
fix decref before incref on buffer item assignments

ABcDexter/cython,slonik-az/cython,madjar/cython,achernet/cython,scoder/cython,andreasvc/cython,fabianrost84/cython,larsmans/cython,dahebolangkuan/cython,marscher/cython,madjar/cython,mrGeen/cython,roxyboy/cython,achernet/cython,encukou/cython,andreasvc/cython,JelleZijlstra/cython,scoder/cython,da-woods/cython,mcanthony/cython,acrispin/cython,mcanthony/cython,madjar/cython,scoder/cython,mcanthony/cython,c-blake/cython,marscher/cython,JelleZijlstra/cython,fperez/cython,cython/cython,mrGeen/cython,da-woods/cython,hhsprings/cython,cython/cython,marscher/cython,hhsprings/cython,scoder/cython,acrispin/cython,andreasvc/cython,acrispin/cython,fperez/cython,encukou/cython,fperez/cython,achernet/cython,marscher/cython,encukou/cython,cython/cython,madjar/cython,hhsprings/cython,mcanthony/cython,larsmans/cython,ChristopherHogan/cython,JelleZijlstra/cython,c-blake/cython,fabianrost84/cython,hickford/cython,acrispin/cython,mcanthony/cython,fabianrost84/cython,achernet/cython,marscher/cython,JelleZijlstra/cython,slonik-az/cython,dahebolangkuan/cython,hickford/cython,slonik-az/cython,larsmans/cython,roxyboy/cython,mrGeen/cython,ABcDexter/cython,da-woods/cython,ChristopherHogan/cython,ChristopherHogan/cython,dahebolangkuan/cython,hhsprings/cython,mrGeen/cython,cython/cython,dahebolangkuan/cython,hickford/cython,hhsprings/cython,encukou/cython,c-blake/cython,hickford/cython,fperez/cython,fabianrost84/cython,mrGeen/cython,slonik-az/cython,madjar/cython,acrispin/cython,fperez/cython,achernet/cython,larsmans/cython,dahebolangkuan/cython,andreasvc/cython,ABcDexter/cython,roxyboy/cython,roxyboy/cython,JelleZijlstra/cython,fabianrost84/cython,ABcDexter/cython,c-blake/cython,ABcDexter/cython,da-woods/cython,andreasvc/cython,larsmans/cython,encukou/cython,roxyboy/cython,slonik-az/cython,c-blake/cython,hickford/cython