[PATCH 20/29] verify_refname_available(): adjust constness in declaration

[Michael Haggerty <mhagger@alum.mit.edu>]

The two string_list arguments can be const.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
This is needed because I want to add a new caller that has const
versions of these lists in hand.

 refs/files-backend.c | 4 ++--
 refs/refs-internal.h | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/refs/files-backend.c b/refs/files-backend.c
index e4cdd5a..e0d9fa3 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2328,8 +2328,8 @@ out:
 }
 
 int verify_refname_available(const char *newname,
-			     struct string_list *extras,
-			     struct string_list *skip,
+			     const struct string_list *extras,
+			     const struct string_list *skip,
 			     struct strbuf *err)
 {
 	struct ref_dir *packed_refs = get_packed_refs(&ref_cache);
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 6b53ba1..aaf56ea 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -116,8 +116,8 @@ enum peel_status peel_object(const unsigned char *name, unsigned char *sha1);
  * extras and skip must be sorted.
  */
 int verify_refname_available(const char *newname,
-			     struct string_list *extras,
-			     struct string_list *skip,
+			     const struct string_list *extras,
+			     const struct string_list *skip,
 			     struct strbuf *err);
 
 /*
-- 
2.8.1