Avoid warning in MatrixFreeTools::compute_diagonal

diff --git a/include/deal.II/matrix_free/tools.h b/include/deal.II/matrix_free/tools.h
index dec6d3bc593760144ace628543331c6e0aa40d2e..22f11b0ec227e2195b5121d769d2b7ef9fa5b296 100644 (file)
--- a/include/deal.II/matrix_free/tools.h
+++ b/include/deal.II/matrix_free/tools.h
@@ -611,7 +611,7 @@ namespace MatrixFreeTools
     // initialize vector
     matrix_free.initialize_dof_vector(diagonal_global, dof_no);
 
-    int dummy;
+    int dummy = 0;
 
     matrix_free.template cell_loop<VectorType, int>(
       [&](const MatrixFree<dim, Number, VectorizedArrayType> &matrix_free,