Merge branch 'ma/lockfile-cleanup'

Code clean-up to adjust to a more recent lockfile API convention that
allows lockfile instances kept on the stack.

* ma/lockfile-cleanup:
  lock_file: move static locks into functions
  lock_file: make function-local locks non-static
  refs.c: do not die if locking fails in `delete_pseudoref()`
  refs.c: do not die if locking fails in `write_pseudoref()`
  t/helper/test-write-cache: clean up lock-handling

bundle.c

@@ -409,7 +409,7 @@ static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
 int create_bundle(struct bundle_header *header, const char *path,
 		  int argc, const char **argv)
 {
-	static struct lock_file lock;
+	struct lock_file lock = LOCK_INIT;
 	int bundle_fd = -1;
 	int bundle_to_stdout;
 	int ref_count = 0;