fix MSVC compiler warning
fix MSVC compiler warning

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