git_status_shortcuts: don't clobber $IFS

test/lib/git/repo_index_test.sh

@@ -68,13 +68,12 @@ EOF
   done
 
   # Setup some custom repos outside the main repo dir
-  IFS=":"
+  local IFS=":"
   for dir in $GIT_REPOS; do
     mkdir -p $dir
     cd $dir
     git init
   done
-  unset IFS
 
   verboseGitCommands
 
@@ -83,9 +82,8 @@ EOF
 
 oneTimeTearDown() {
   rm -rf "${GIT_REPO_DIR}"
-  IFS=":"
+  local IFS=":"
   for dir in $GIT_REPOS; do rm -rf $dir; done
-  unset IFS
 }
 
 ensureIndex() {