git-p4: Fix warnings about non-existant refs/remotes/p4/HEAD ref when running git-p4 sync the first time after a git clone.
git-p4: Fix warnings about non-existant refs/remotes/p4/HEAD ref when running git-p4 sync the first time after a git clone.

Don't create the p4/HEAD symbolic ref if p4/master doesn't exist yet.

Signed-off-by: Simon Hausmann <088e16a1019277b15d58faf0541e11910eb756f6@lst.de>
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