[PATCH] refs: mark some symbols static

Signed-off-by: Ramsay Jones <redacted>
---

Hi David,

If you need to re-roll your 'dt/refs-backend-lmdb' branch, could
you please squash the relevant parts of this patch into yours.

[yes, I didn't reference the movement of the external declaration
in the commit message! :-D ]

Thanks!

ATB,
Ramsay Jones

 refs.c               | 7 +++----
 refs/files-backend.c | 2 +-
 refs/refs-internal.h | 2 ++
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/refs.c b/refs.c
index 0be7065..c0faa97 100644
--- a/refs.c
+++ b/refs.c

@@ -9,7 +9,7 @@
 #include "object.h"
 #include "tag.h"
 
-const char split_transaction_fail_warning[] =
+static const char split_transaction_fail_warning[] =
 	"A ref transaction was split across two refs backends.  Part of the "
 	"transaction succeeded, but then the update to the per-worktree refs "
 	"failed.  Your repository may be in an inconsistent state.";

@@ -17,12 +17,11 @@ const char split_transaction_fail_warning[] =
 /*
  * We always have a files backend and it is the default.
  */
-extern struct ref_be refs_be_files;
-struct ref_be *the_refs_backend = &refs_be_files;
+static struct ref_be *the_refs_backend = &refs_be_files;
 /*
  * List of all available backends
  */
-struct ref_be *refs_backends = &refs_be_files;
+static struct ref_be *refs_backends = &refs_be_files;
 
 const char *refs_backend_type;
 

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 0efc507..e8181ae 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c

@@ -3280,7 +3280,7 @@ static int ref_present(const char *refname,
 	return string_list_has_string(affected_refnames, refname);
 }
 
-void files_init_backend(void *data)
+static void files_init_backend(void *data)
 {
 	/* do nothing */
 }

diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 9c17fdf..8fb360d 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h

@@ -313,4 +313,6 @@ struct ref_be {
 	for_each_replace_ref_fn *for_each_replace_ref;
 };
 
+extern struct ref_be refs_be_files;
+
 #endif /* REFS_REFS_INTERNAL_H */