Fix pointer initalization

Author: pblottiere

src/app/qgsnewauxiliarylayerdialog.h

@@ -47,7 +47,7 @@ class APP_EXPORT QgsNewAuxiliaryLayerDialog: public QDialog, private Ui::QgsNewA
   private:
     void accept() override;
 
-    QgsVectorLayer *mLayer;
+    QgsVectorLayer *mLayer = nullptr;
 };
 
 #endif

src/core/qgsauxiliarystorage.h

@@ -204,7 +204,7 @@ class CORE_EXPORT QgsAuxiliaryLayer : public QgsVectorLayer
 
   private:
     QgsVectorLayerJoinInfo mJoinInfo;
-    const QgsVectorLayer *mLayer;
+    const QgsVectorLayer *mLayer = nullptr;
 };