Declare the return value to be const to make it clear that we aren't
giving callers permission to write over the string that it points at.
(The return value is the filename field of a struct lock_file, which
can be used by a signal handler at any time and therefore shouldn't be
tampered with.)

Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
---
 builtin/commit.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index d9550c5..2e2d8bb 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -302,8 +302,8 @@ static void refresh_cache_or_die(int refresh_flags)
                die_resolve_conflict("commit");
 }
 
-static char *prepare_index(int argc, const char **argv, const char *prefix,
-                          const struct commit *current_head, int is_status)
+static const char *prepare_index(int argc, const char **argv, const char 
*prefix,
+                                const struct commit *current_head, int 
is_status)
 {
        int fd;
        struct string_list partial;
-- 
1.9.1

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