path: move `validate_headref()` to its only user

While `validate_headref()` is only called from `is_git_directory()` in
"setup.c", it is currently implemented in "path.c". Move it over such
that it becomes clear that it is only really used during setup in order
to discover repositories.

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

1 files changed, 0 insertions, 1 deletions

diff --git a/path.h b/path.h
index ea96487b29..c3bc8617bd 100644
--- a/path.h
+++ b/path.h
@@ -173,7 +173,6 @@ const char *git_path_fetch_head(struct repository *r);
 const char *git_path_shallow(struct repository *r);
 
 int ends_with_path_components(const char *path, const char *components);
-int validate_headref(const char *ref);
 
 int calc_shared_perm(int mode);
 int adjust_shared_perm(const char *path);