drop some redundant C labels in if-blocks
drop some redundant C labels in if-blocks

--HG--
extra : amend_source : affe6e89d8c2c49654f376fbbda3b1ad29190895

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