From e089888a295bfaff77ce18f799da91ec374461e4 Mon Sep 17 00:00:00 2001
From: Stefano Zampini <stefano.zampini@gmail.com>
Date: Mon, 16 Jan 2023 12:24:05 +0300
Subject: [PATCH] Remove PETSC_NULL occurrences

---
 source/lac/petsc_solver.cc      | 2 +-
 source/lac/petsc_vector_base.cc | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/source/lac/petsc_solver.cc b/source/lac/petsc_solver.cc
index 8a4ec5c471..834a3b0c9f 100644
--- a/source/lac/petsc_solver.cc
+++ b/source/lac/petsc_solver.cc
@@ -779,7 +779,7 @@ namespace PETScWrappers
         ierr = KSPSetConvergenceTest(solver_data->ksp,
                                      &convergence_test,
                                      reinterpret_cast<void *>(&solver_control),
-                                     PETSC_NULL);
+                                     nullptr);
         AssertThrow(ierr == 0, ExcPETScError(ierr));
 
         /*
diff --git a/source/lac/petsc_vector_base.cc b/source/lac/petsc_vector_base.cc
index 671a198973..5998d1894c 100644
--- a/source/lac/petsc_vector_base.cc
+++ b/source/lac/petsc_vector_base.cc
@@ -50,7 +50,7 @@ namespace PETScWrappers
             VecGetOwnershipRange(vector.vector, &begin, &end);
           AssertThrow(ierr == 0, ExcPETScError(ierr));
 
-          Vec locally_stored_elements = PETSC_NULL;
+          Vec locally_stored_elements = nullptr;
           ierr = VecGhostGetLocalForm(vector.vector, &locally_stored_elements);
           AssertThrow(ierr == 0, ExcPETScError(ierr));
 
@@ -201,7 +201,7 @@ namespace PETScWrappers
 
     if (has_ghost_elements())
       {
-        Vec ghost = PETSC_NULL;
+        Vec ghost = nullptr;
         ierr      = VecGhostGetLocalForm(vector, &ghost);
         AssertThrow(ierr == 0, ExcPETScError(ierr));
 
-- 
2.39.5