pull: Fix pull --clean for Linuxbrew (#304)
pull: Fix pull --clean for Linuxbrew (#304)

`user` was used while undefined.
hanxue/linuxbrew,Linuxbrew/brew,rwhogg/brew,rwhogg/brew,maxim-belkin/brew,hanxue/linuxbrew,Linuxbrew/brew,hanxue/linuxbrew,maxim-belkin/brew,Linuxbrew/brew,rwhogg/brew,Linuxbrew/brew,maxim-belkin/brew