qios: improve efficiency of timeval
qios: improve efficiency of timeval

Change-Id: I37f4ade2149037f73a3819ac91d479e16ad18605
Reviewed-on: http://gerrit.aldebaran.lan/30028
Reviewed-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>
Reviewed-by: sdalibard <4c8b42019ca2bae473a136ea748c87d39d2f6b07@aldebaran-robotics.com>
Reviewed-by: ccollette <f1523f0b3f67ef259a5d1b80194df37fa8d52681@aldebaran-robotics.com>
Reviewed-by: sbarthelemy <9c154f64c36738f8e44d945c231ac417d15bd66e@aldebaran-robotics.com>
Tested-by: sbarthelemy <9c154f64c36738f8e44d945c231ac417d15bd66e@aldebaran-robotics.com>
Reviewed-on: http://gerrit.aldebaran.lan/30174

bsautron/libqi,aldebaran/libqi,vbarbaresi/libqi,aldebaran/libqi,aldebaran/libqi