Revert "rebase: fix run_specific_rebase's use of "return" on FreeBSD"

This reverts commit 99855ddf4b.

The workaround 99855ddf introduced to deal with problematic
"return" statements in scripts run by "dot" commands located
inside functions only handles one part of the problem.  The
issue has now been addressed by not using "return" statements
in this way in the git-rebase--*.sh scripts.

This workaround is therefore no longer necessary, so clean
up the code by reverting it.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
Acked-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-rebase.sh

@@ -169,22 +169,13 @@ You can run "git stash pop" or "git stash drop" at any time.
 	rm -rf "$state_dir"
 }
 
-run_specific_rebase_internal () {
+run_specific_rebase () {
 	if [ "$interactive_rebase" = implied ]; then
 		GIT_EDITOR=:
 		export GIT_EDITOR
 		autosquash=
 	fi
-	# On FreeBSD, the shell's "return" returns from the current
-	# function, not from the current file inclusion.
-	# run_specific_rebase_internal has the file inclusion as a
-	# last statement, so POSIX and FreeBSD's return will do the
-	# same thing.
 	. git-rebase--$type
-}
-
-run_specific_rebase () {
-	run_specific_rebase_internal
 	ret=$?
 	if test $ret -eq 0
 	then