Remove commented code from QBuffer autotest.

The removed code was commented-out before the tests were imported into
the Qt repository in June 2006.  This code is no longer valid as the
warning messages it relates to are not produced by any code in qtbase.

Change-Id: Iac63b27387b51a71c567386ca61faf5fb00c3364
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>

tests/auto/corelib/io/qbuffer/tst_qbuffer.cpp

@@ -148,9 +148,6 @@ void tst_QBuffer::open()
 // some status() tests, too
 void tst_QBuffer::readBlock()
 {
-//    QTest::ignoreMessage(QtWarningMsg, "QIODevice::read: File not open");
-//    QTest::ignoreMessage(QtWarningMsg, "QIODevice::read: Read operation not permitted");
-
     const int arraySize = 10;
     char a[arraySize];
     QBuffer b;