gui: Silence unused var warning.

diff --git a/gui/retracer.cpp b/gui/retracer.cpp
index 8a766faccfe682a4f822050b767b6fc38fc92f4c..213704b8e61ef0a4f6a200c8da5d48cb37818d83 100644 (file)
--- a/gui/retracer.cpp
+++ b/gui/retracer.cpp
@@ -411,6 +411,7 @@ void Retracer::run()
                     unsigned char *scanLine = snapshot.scanLine(y);
                     qint64 readBytes = io.read((char *) scanLine, rowBytes);
                     Q_ASSERT(readBytes == rowBytes);
+                    (void)readBytes;
                 }
 
                 QImage thumb = thumbnail(snapshot);