Signal Spy: prefer size_t instead of unsigned int
Signal Spy: prefer size_t instead of unsigned int

It removes a bunch of warnings in the usual case where you use the size of
the records to know how many records you are expecting next.

Change-Id: I39fca04209f45db9af46447a160f316c6a89cfaa
Reviewed-on: http://gerrit.aldebaran.lan/70695
Reviewed-by: hcuche <2a0975cc082cedff4d4350e3f6ec187146151bc6@aldebaran.com>
Tested-by: vpaleologue <cb19838a79eb484e12a6960acfbf7c16dfdb80d9@aldebaran-robotics.com>

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi