files-backend: make files_log_ref_write() static

Created in 5f3c3a4e6f (files_log_ref_write: new function - 2015-11-10)
but probably never used outside refs-internal.c

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

refs/files-backend.c

@@ -165,6 +165,9 @@ static struct ref_entry *create_dir_entry(struct files_ref_store *ref_store,
 					  const char *dirname, size_t len,
 					  int incomplete);
 static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry);
+static int files_log_ref_write(const char *refname, const unsigned char *old_sha1,
+			       const unsigned char *new_sha1, const char *msg,
+			       int flags, struct strbuf *err);
 
 static struct ref_dir *get_ref_dir(struct ref_entry *entry)
 {
@@ -2831,7 +2834,7 @@ static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
 	return 0;
 }
 
-int files_log_ref_write(const char *refname, const unsigned char *old_sha1,
+static int files_log_ref_write(const char *refname, const unsigned char *old_sha1,
 			       const unsigned char *new_sha1, const char *msg,
 			       int flags, struct strbuf *err)
 {

refs/refs-internal.h

@@ -228,10 +228,6 @@ struct ref_transaction {
 	enum ref_transaction_state state;
 };
 
-int files_log_ref_write(const char *refname, const unsigned char *old_sha1,
-			const unsigned char *new_sha1, const char *msg,
-			int flags, struct strbuf *err);
-
 /*
  * Check for entries in extras that are within the specified
  * directory, where dirname is a reference directory name including