QtIFW

Fix [-Wformat-security] warning.

Change-Id: Iae180cb0f13a39daacc1cadd04094bfddd33b6ab
Reviewed-by: Niels Weber <niels.weber@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>