git-stash: Make sure reflog is created for refs/stash
git-stash: Make sure reflog is created for refs/stash

Earlier commit 7ab3cc70 fixed "stash clear" but broke save_stash,
because it forgot to make sure the reflog file exists before saving.

Signed-off-by: Nanako Shiraishi <7d97fbf70141dda63063292abadb698cc511a125@bluebottle.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git