e32e00d (git-p4: better message for "git-p4 sync" when not cloned,
2011-02-19) broke the use of the "@all" revision specifier, e.g.,
git-p4 clone //depot/xxx@all
Fix it as per Tor Arvid's quick patch.
Signed-off-by: Pete Wyckoff <pw@padd.com> Reported-by: Anatol Pomozov <anatol.pomozov@gmail.com> Based-on-patch-by: Tor Arvid Lund <torarvid@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>