Fix listing input devices in qsysinfo example.
Fix listing input devices in qsysinfo example.

Assignments in if-clause instead of comparison whilst building list of input devices for a device.
Task-Number: QTMOBILITY-2087

Change-Id: Ic1dc25fa189b3ec930e14e2f05c9a34a636163b7
Reviewed-by: Lorn Potter <0e329dfd61bdd4e2b2b708a31f12f199a7656feb@jollamobile.com>

enthought/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,qtproject/qt-mobility,enthought/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,qtproject/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility