From 4d396271e1b650f1225ea27240af8616283cfa39 Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <jan.lazo@mail.utoronto.ca>
Date: Fri, 2 Apr 2021 08:27:53 -0400
Subject: [PATCH] clang/API: copy "" if orig_save is NULL

orig_save can be NULL if ExpandOne() is misused
if ExpandOne() is first called with mode "WILD_CANCEL" or "WILD_APPLY"
before other modes.
---
 src/nvim/ex_getln.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index 76df01c205..38385d19b2 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -4093,9 +4093,10 @@ ExpandOne (
   }
 
   if (mode == WILD_CANCEL) {
-    ss = vim_strsave(orig_save);
+    ss = vim_strsave(orig_save ? orig_save : (char_u *)"");
   } else if (mode == WILD_APPLY) {
-    ss =  vim_strsave(findex == -1 ? orig_save : xp->xp_files[findex]);
+    ss =  vim_strsave(findex == -1 ? (orig_save ? orig_save : (char_u *)"") :
+                      xp->xp_files[findex]);
   }
 
   /* free old names */