config: make the config source const

The `struct git_config_source` passed to `config_with_options()` is
never modified. Let's mark it as `const` to clarify.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/config.h b/config.h
index db8b608064..e66c84520b 100644
--- a/config.h
+++ b/config.h
@@ -232,7 +232,7 @@ void git_config(config_fn_t fn, void *);
  * sets `opts.respect_includes` to `1` by default.
  */
 int config_with_options(config_fn_t fn, void *,
-			struct git_config_source *config_source,
+			const struct git_config_source *config_source,
 			struct repository *repo,
 			const struct config_options *opts);