From 32e15c3f458c2e8838a9ecf7d478ecb6750516bf Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Tue, 20 Jul 2021 23:22:37 +0100
Subject: [PATCH] canonicalise_opt must always return heap memory.

Thanks to Max Julian Hofmann for spotting this.
---
 src/option.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/option.c b/src/option.c
index 84c9ef3..ca8563a 100644
--- a/src/option.c
+++ b/src/option.c
@@ -654,7 +654,7 @@ static char *canonicalise_opt(char *s)
     return 0;
 
   if (strlen(s) == 0)
-    return "";
+    return opt_string_alloc("");
 
   unhide_metas(s);
   if (!(ret = canonicalise(s, &nomem)) && nomem)