The documentation of QIODevice::pos() states: "For sequential devices or
closed devices, where there is no concept of a "current position", 0 is
returned". The test had a disabled check for a position of -1 before
the device is opened. Make the test agree with the documentation.
Change-Id: Ide5729bfc825cdb84caf4851574a57d3ef42ccb2
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>