fix debug log typo

Change-Id: I16a8b1b3c54651b2fb1ee3961ea7a0fd9858efbc
Reviewed-on: http://gerrit.aldebaran.lan/38042
Tested-by: gerrit
Approved: hkouki <hkouki@aldebaran-robotics.com>
Reviewed-by: hkouki <hkouki@aldebaran-robotics.com>
Tested-by: hkouki <hkouki@aldebaran-robotics.com>