fix some C compiler warnings
fix some C compiler warnings

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