Fix warning

nyalldawson · nyalldawson · commit f5fa3281b47a · 2018-12-03T06:16:58.000+10:00
(cherry picked from commit 76cde63)
diff --git a/tests/src/core/testqgsmarkerlinesymbol.cpp b/tests/src/core/testqgsmarkerlinesymbol.cpp
@@ -67,7 +67,6 @@ class TestQgsMarkerLineSymbol : public QObject
 
     QString mTestDataDir;
     QgsVectorLayer *mLinesLayer = nullptr;
-    QgsVectorLayer *mPolygonsLayer = nullptr;
     QgsMapSettings *mMapSettings = nullptr;
     QString mReport;
 };
