In a perforce setup where login is not required, communication fails
because p4_check_access does not understand the response from the p4
client. Fixed by detecting and ignoring the "info" response.
Signed-off-by: Peter Osterlund <peterosterlund2@gmail.com> Acked-by: Luke Diamand <luke@diamand.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>