The opt_ff variable is supposed to have an allocated string (strdup), we
can't just overwrite it with a const char *.

Functionally it doesn't matter, since after this point opt_ff is never
freed, only accessed, but still...

It's better to be consistent.

Signed-off-by: Felipe Contreras <redacted>
---
 builtin/pull.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/builtin/pull.c b/builtin/pull.c
index 54c58618e9..0735c77f42 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c

@@ -1057,7 +1057,8 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 
 		if (can_ff) {
 			/* we can fast-forward this without invoking rebase */
-			opt_ff = "--ff-only";
+			free(opt_ff);
+			opt_ff = xstrdup_or_null("--ff-only");
 			ret = run_merge();
 		} else {
 			ret = run_rebase(&curr_head, merge_heads.oid, &rebase_fork_point);

-- 
2.29.2