Use QScopedValueRollback more as a reentrancy guard

It is documented for the use, but we were rarely using it.

Change-Id: I812b9e6c8fbf204aba43ce2b79eca308ca75de88
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/corelib/io/qwindowspipewriter.cpp b/src/corelib/io/qwindowspipewriter.cpp
index 92e8b6db52..32536f495b 100644
--- a/src/corelib/io/qwindowspipewriter.cpp
+++ b/src/corelib/io/qwindowspipewriter.cpp
@@ -39,6 +39,7 @@
 
 #include "qwindowspipewriter_p.h"
 #include "qiodevice_p.h"
+#include <qscopedvaluerollback.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -111,9 +112,8 @@ void QWindowsPipeWriter::emitPendingBytesWrittenValue()
 
         emit canWrite();
         if (!inBytesWritten) {
-            inBytesWritten = true;
+            QScopedValueRollback<bool> guard(inBytesWritten, true);
             emit bytesWritten(bytes);
-            inBytesWritten = false;
         }
     }
 }