If the download fails, delete the half-file
If the download fails, delete the half-file

Otherwise next time it will assume the half-file is the whole file and fail
the md5 check.

EricFromCanada/brew,staticfloat/brew,konqui/brew,mgrimes/brew,gordonmcshane/homebrew,ilovezfs/brew,bfontaine/brew,Homebrew/brew,Linuxbrew/brew,zmwangx/brew,mahori/brew,aw1621107/brew,mgrimes/brew,pseudocody/brew,claui/brew,MikeMcQuaid/brew,konqui/brew,claui/brew,gregory-nisbet/brew,AnastasiaSulyagina/brew,mahori/brew,konqui/brew,amar-laksh/brew_sudo,AnastasiaSulyagina/brew,jmsundar/brew,Homebrew/brew,nandub/brew,mistydemeo/homebrew,alyssais/brew,bfontaine/brew,Homebrew/brew,vitorgalvao/brew,sjackman/homebrew,zmwangx/brew,toonetown/homebrew,Linuxbrew/brew,jmsundar/brew,EricFromCanada/brew,claui/brew,gordonmcshane/homebrew,MikeMcQuaid/brew,reelsense/brew,DomT4/brew,nandub/brew,muellermartin/dist,ilovezfs/brew,mgrimes/brew,AnastasiaSulyagina/brew,reelsense/brew,palxex/brew,gregory-nisbet/brew,reitermarkus/brew,jmsundar/brew,rwhogg/brew,vitorgalvao/brew,sjackman/homebrew,vitorgalvao/brew,mistydemeo/homebrew,MikeMcQuaid/brew,reelsense/brew,Linuxbrew/brew,DomT4/brew,vitorgalvao/brew,mistydemeo/homebrew,alyssais/brew,JCount/brew,muellermartin/dist,DomT4/brew,maxim-belkin/brew,bfontaine/brew,amar-laksh/brew_sudo,Linuxbrew/brew,alyssais/brew,hanxue/linuxbrew,tonyg/homebrew,tonyg/homebrew,sjackman/homebrew,palxex/brew,JCount/brew,maxim-belkin/brew,toonetown/homebrew,ilovezfs/brew,mahori/brew,DomT4/brew,pseudocody/brew,tonyg/homebrew,MikeMcQuaid/brew,JCount/brew,palxex/brew,hanxue/linuxbrew,hanxue/linuxbrew,pseudocody/brew,nandub/brew,muellermartin/dist,sjackman/homebrew,toonetown/homebrew,staticfloat/brew,konqui/brew,gregory-nisbet/brew,rwhogg/brew,reitermarkus/brew,aw1621107/brew,EricFromCanada/brew,maxim-belkin/brew,gordonmcshane/homebrew,reitermarkus/brew,staticfloat/brew,claui/brew,amar-laksh/brew_sudo,nandub/brew,zmwangx/brew,reitermarkus/brew,rwhogg/brew,EricFromCanada/brew,JCount/brew,mahori/brew,aw1621107/brew,Homebrew/brew