worktree: use strbuf_add_absolute_path() directly

absolute_path() is a wrapper for strbuf_add_absolute_path().  Call the
latter directly for adding absolute paths to a strbuf.  That's shorter
and avoids an extra string copy.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/worktree.c b/worktree.c
index 199b1ef..6b4f5f3 100644
--- a/worktree.c
+++ b/worktree.c
@@ -80,7 +80,7 @@
 	int is_bare = 0;
 	int is_detached = 0;
 
-	strbuf_addstr(&worktree_path, absolute_path(get_git_common_dir()));
+	strbuf_add_absolute_path(&worktree_path, get_git_common_dir());
 	is_bare = !strbuf_strip_suffix(&worktree_path, "/.git");
 	if (is_bare)
 		strbuf_strip_suffix(&worktree_path, "/.");
@@ -125,7 +125,7 @@
 	strbuf_rtrim(&worktree_path);
 	if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
 		strbuf_reset(&worktree_path);
-		strbuf_addstr(&worktree_path, absolute_path("."));
+		strbuf_add_absolute_path(&worktree_path, ".");
 		strbuf_strip_suffix(&worktree_path, "/.");
 	}