debrew/irb: fix trap handling
debrew/irb: fix trap handling

EricFromCanada/brew,claui/brew,JCount/brew,Homebrew/brew,EricFromCanada/brew,MikeMcQuaid/brew,claui/brew,EricFromCanada/brew,JCount/brew,nandub/brew,nandub/brew,claui/brew,Homebrew/brew,EricFromCanada/brew,MikeMcQuaid/brew,JCount/brew,nandub/brew,MikeMcQuaid/brew,Homebrew/brew,JCount/brew,claui/brew,Homebrew/brew,MikeMcQuaid/brew,nandub/brew