QIODevice::atEnd(): fix debug message output

For sequential devices, duplicated bytesAvailable() calls can produce
different results. To avoid a wrong output, print exactly the same
value as would be returned.

Change-Id: I02615dd7375516f7b263eea56bfcf15e2889e6e3
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

src/corelib/io/qiodevice.cpp

@@ -693,12 +693,13 @@ bool QIODevice::seek(qint64 pos)
 bool QIODevice::atEnd() const
 {
     Q_D(const QIODevice);
+    const bool result = (d->openMode == NotOpen || (d->buffer.isEmpty()
+                                                    && bytesAvailable() == 0));
 #if defined QIODEVICE_DEBUG
     printf("%p QIODevice::atEnd() returns %s, d->openMode == %d, d->pos == %lld\n", this,
-           (d->openMode == NotOpen || d->pos == size()) ? "true" : "false", int(d->openMode),
-           d->pos);
+           result ? "true" : "false", int(d->openMode), d->pos);
 #endif
-    return d->openMode == NotOpen || (d->buffer.isEmpty() && bytesAvailable() == 0);
+    return result;
 }
 
 /*!