Fix revision calculation in vc-git-mode-line-string

* lisp/vc/vc-git.el (vc-git-mode-line-string): Use
  vc-git-working-revision because vc-working-revision needs to decide
  the backend and may return nil.

diff --git a/lisp/vc/vc-git.el b/lisp/vc/vc-git.el
index 5d06bf7f3572c18003fff47a412750215834b8dd..d5ba0c8be7d910aa90b639a88bea77191654e563 100644 (file)
--- a/lisp/vc/vc-git.el
+++ b/lisp/vc/vc-git.el
@@ -278,7 +278,7 @@ Should be consistent with the Git config value i18n.logOutputEncoding."
 
 (defun vc-git-mode-line-string (file)
   "Return a string for `vc-mode-line' to put in the mode line for FILE."
-  (let* ((rev (vc-working-revision file))
+  (let* ((rev (vc-git-working-revision file))
          (disp-rev (or (vc-git--symbolic-ref file)
                        (substring rev 0 7)))
          (def-ml (vc-default-mode-line-string 'Git file))