Merge branch 'ab/unused-script-helpers'

Code clean-up.

* ab/unused-script-helpers:
  test-lib: remove unused $_x40 and $_z40 variables
  git-bisect: remove unused SHA-1 $x40 shell variable
  git-sh-setup: remove unused "pull with rebase" message
  git-submodule: remove unused is_zero_oid() function

git-submodule.sh

@@ -63,11 +63,6 @@ isnumber()
 	n=$(($1 + 0)) 2>/dev/null && test "$n" = "$1"
 }
 
-# Given a full hex object ID, is this the zero OID?
-is_zero_oid () {
-	echo "$1" | sane_egrep '^0+$' >/dev/null 2>&1
-}
-
 # Sanitize the local git environment for use within a submodule. We
 # can't simply use clear_local_git_env since we want to preserve some
 # of the settings from GIT_CONFIG_PARAMETERS.