parse-options: const parse_options_concat() parameters

Document the fact that the function doesn't modify the two option arrays
passed to it by adding the keyword const to each parameter.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/parse-options-cb.c b/parse-options-cb.c
index db6f666ef7..7d56681130 100644
--- a/parse-options-cb.c
+++ b/parse-options-cb.c
@@ -181,7 +181,8 @@ struct option *parse_options_dup(const struct option *o)
 	return opts;
 }
 
-struct option *parse_options_concat(struct option *a, struct option *b)
+struct option *parse_options_concat(const struct option *a,
+				    const struct option *b)
 {
 	struct option *ret;
 	size_t a_len = parse_options_count(a);