[PATCH v6 21/27] mailmap: always store allocated strings in mailmap blob

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Same as with the preceding commit, the `git_mailmap_blob` may sometimes
contain an allocated string and sometimes it may contain a string
constant. This is risky and can easily lead to bugs in case the variable
is getting re-assigned, where the code may then try to free the previous
value to avoid memory leaks.

Safeguard the code by always storing allocated strings in the variable.

Signed-off-by: Patrick Steinhardt <ps@xxxxxx>
---
 mailmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mailmap.c b/mailmap.c
index b2efe29b3d..3d1e092fef 100644
--- a/mailmap.c
+++ b/mailmap.c
@@ -216,7 +216,7 @@ int read_mailmap(struct string_list *map)
 	map->cmp = namemap_cmp;
 
 	if (!git_mailmap_blob && is_bare_repository())
-		git_mailmap_blob = "HEAD:.mailmap";
+		git_mailmap_blob = xstrdup("HEAD:.mailmap");
 
 	if (!startup_info->have_repository || !is_bare_repository())
 		err |= read_mailmap_file(map, ".mailmap",
-- 
2.45.2.436.gcd77e87115.dirty

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