Fix uses of qRound on non-floating-point types.

Fix uses of qRound on non-floating-point types.

It's silly to round integeres, since they are already round. At most,
this would waste CPU cycles without any benefit.

Change-Id: I6fc0152f4416d723b65966e5d48cc7a07957b83c
Merge-request: 17
Reviewed-by: Olivier Goffart <olivier.goffart@nokia.com>
Reviewed-on: http://codereview.qt.nokia.com/1541
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>