Fix powerline.c styling
Fix powerline.c styling

Also makes it compile with -std=c89 (except for snprintf) or just -std=c99,
-Wall, -pedantic.

russellb/powerline,bartvm/powerline,firebitsbr/powerline,DoctorJellyface/powerline,wfscheper/powerline,IvanAli/powerline,DoctorJellyface/powerline,blindFS/powerline,IvanAli/powerline,xfumihiro/powerline,dragon788/powerline,wfscheper/powerline,firebitsbr/powerline,firebitsbr/powerline,xxxhycl2010/powerline,Liangjianghao/powerline,seanfisk/powerline,s0undt3ch/powerline,kenrachynski/powerline,Liangjianghao/powerline,bartvm/powerline,lukw00/powerline,bezhermoso/powerline,prvnkumar/powerline,xfumihiro/powerline,S0lll0s/powerline,prvnkumar/powerline,EricSB/powerline,xxxhycl2010/powerline,s0undt3ch/powerline,seanfisk/powerline,cyrixhero/powerline,wfscheper/powerline,magus424/powerline,s0undt3ch/powerline,Luffin/powerline,darac/powerline,darac/powerline,blindFS/powerline,blindFS/powerline,cyrixhero/powerline,areteix/powerline,russellb/powerline,seanfisk/powerline,prvnkumar/powerline,lukw00/powerline,junix/powerline,EricSB/powerline,junix/powerline,kenrachynski/powerline,dragon788/powerline,bartvm/powerline,magus424/powerline,bezhermoso/powerline,junix/powerline,EricSB/powerline,Luffin/powerline,xfumihiro/powerline,QuLogic/powerline,IvanAli/powerline,areteix/powerline,Liangjianghao/powerline,DoctorJellyface/powerline,kenrachynski/powerline,magus424/powerline,cyrixhero/powerline,darac/powerline,areteix/powerline,QuLogic/powerline,xxxhycl2010/powerline,russellb/powerline,bezhermoso/powerline,S0lll0s/powerline,QuLogic/powerline,lukw00/powerline,Luffin/powerline,S0lll0s/powerline,dragon788/powerline