attr.c: tighten constness around "git_attr" structure

It holds an interned string, and git_attr_name() is a way to peek
into it.  Make sure the involved pointer types are pointer-to-const.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/attr.h b/attr.h
index 8b08d33af8..00d7a662c9 100644
--- a/attr.h
+++ b/attr.h
@@ -25,7 +25,7 @@ extern const char git_attr__false[];
  * Unset one is returned as NULL.
  */
 struct git_attr_check {
-	struct git_attr *attr;
+	const struct git_attr *attr;
 	const char *value;
 };
 
@@ -34,7 +34,7 @@ struct git_attr_check {
  * return value is a pointer to a null-delimited string that is part
  * of the internal data structure; it should not be modified or freed.
  */
-char *git_attr_name(struct git_attr *);
+extern const char *git_attr_name(const struct git_attr *);
 
 int git_check_attr(const char *path, int, struct git_attr_check *);