Merge branch 'km/avoid-non-function-return-in-rebase'

Merge branch 'km/avoid-non-function-return-in-rebase'

Work around /bin/sh that does not like "return" at the top-level
of a file that is dot-sourced from inside a function definition.

* km/avoid-non-function-return-in-rebase:
  Revert "rebase: fix run_specific_rebase's use of "return" on FreeBSD"
  rebase: avoid non-function use of "return" on FreeBSD