QByteArray::at() assert with wrong limit

The documentation states that "QByteArray ensures that the byte at position size() is always '\0'" Ref: http://qt-project.org/doc/qt-4.8/qbytearray.html#size

But the code triggers the following while trying to access that last byte:

ASSERT: "i >= 0 && i < size()" in file .../include/QtCore/qbytearray.h, line 414

Changing the assertion fixes the problem.