tests: Removes unused argument variable.

Change-Id: Ic9298f8d8fea549449387444bc16125279c4f2d8
Reviewed-on: http://gerrit2.aldebaran.lan/1335
Reviewed-by: vincent.palancher <vincent.palancher@softbankrobotics.com>
Reviewed-by: sbarthelemy <sbarthelemy@aldebaran-robotics.com>
Reviewed-by: philippe.martin <philippe.martin@softbankrobotics.com>
Tested-by: sbarthelemy <sbarthelemy@aldebaran-robotics.com>

Author: Sébastien Barthélémy

tests/moduletest.cpp

@@ -64,7 +64,7 @@ std::string Cat::meow(int volume)
   return "meow";
 }
 
-bool Cat::eat(const Mouse& m)
+bool Cat::eat(const Mouse&)
 {
   qiLogInfo() << "eating mouse";
   return true;