patch 9.0.1391: "clear" macros are not always used Commit: https://github.com/vim/vim/commit/960dcbd098c761dd623bec9492d5391ff6e8dceb Author: Yegappan Lakshmanan <yegappan@yahoo.com> Date: Tue Mar 7 17:45:11 2023 +0000 patch 9.0.1391: "clear" macros are not always used Problem: "clear" macros are not always used. Solution: Use ALLOC_ONE, VIM_CLEAR, CLEAR_POINTER and CLEAR_FIELD in more places. (Yegappan Lakshmanan, closes #12104)

--- a/src/diff.c
+++ b/src/diff.c
@@ -726,10 +726,7 @@ diff_redraw(
 clear_diffin(diffin_T *din)
 {
     if (din->din_fname == NULL)
-    {
-	vim_free(din->din_mmfile.ptr);
-	din->din_mmfile.ptr = NULL;
-    }
+	VIM_CLEAR(din->din_mmfile.ptr);
     else
 	mch_remove(din->din_fname);
 }