Merge branch 'nd/clear-gitenv-upon-use-of-alias'

The automatic typo correction applied to an alias was broken with a recent change already in 'master'. * nd/clear-gitenv-upon-use-of-alias: restore_env(): free the saved environment variable once we are done git: simplify environment save/restore logic git: protect against unbalanced calls to {save,restore}_env() git: remove an early return from save_env_before_alias()