[gnote/gnome-40: 2/3] Fix build: NULL is undefined, use C++11 nullptr intead

[Aurimas Černius <aurimasc src gnome org>]

commit f7cedffc3dc37524f9edb3a05aff2b657398aeac
Author: Hubert Figuière <hub figuiere net>
Date:   Sun Apr 25 13:31:54 2021 -0400

    Fix build: NULL is undefined, use C++11 nullptr intead
    
    https://gitlab.gnome.org/GNOME/gnote/-/issues/47

 src/abstractaddin.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/abstractaddin.cpp b/src/abstractaddin.cpp
index 764b5bde..3b4e4fa1 100644
--- a/src/abstractaddin.cpp
+++ b/src/abstractaddin.cpp
@@ -26,7 +26,7 @@
 namespace gnote {
 
   AbstractAddin::AbstractAddin()
-    : m_gnote(NULL)
+    : m_gnote(nullptr)
     , m_disposing(false)
   {
   }