commit 0b3ec192259a65971001ce8f0de85a9c1e71d9c7
author Serhiy Storchaka <storchaka@gmail.com> Thu Mar 23 17:53:47 2017 +0200
committer GitHub <noreply@github.com> Thu Mar 23 17:53:47 2017 +0200
tree a1be55ac1679e3b80ccb4cc2e31c5c57fc4bbdc9
parent aefa7ebf0ff0f73feee7ab24f4cdcb2014d83ee5

Use NULL rather than 0. (#778)

There was few cases of using literal 0 instead of NULL in the context of
pointers.  While this was a legitimate C code, using NULL rather than 0 makes
the code clearer.

Modules/_tkinter.c

diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index ff51674..7ed2b02 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -1378,7 +1378,7 @@
 
     else if (!(PyTuple_Check(args) || PyList_Check(args))) {
         objv[0] = AsObj(args);
-        if (objv[0] == 0)
+        if (objv[0] == NULL)
             goto finally;
         objc = 1;
         Tcl_IncrRefCount(objv[0]);