Fix problem with non-absolute names

* lisp/files.el (file-name-split): Fix problem with non-absolute
names.

2 files changed, 2 insertions, 2 deletions

diff --git a/lisp/files.el b/lisp/files.el
index c694df38268..3490d0428a0 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -5069,7 +5069,7 @@ On most systems, this will be true:
         (setq filename (and dir (directory-file-name dir)))
         ;; If there's nothing left to peel off, we're at the root and
         ;; we can stop.
-        (when (equal dir filename)
+        (when (and dir (equal dir filename))
           (push "" components)
           (setq filename nil))))
     components))
diff --git a/test/lisp/files-tests.el b/test/lisp/files-tests.el
index 787e6390a6e..d00f1ce3263 100644
--- a/test/lisp/files-tests.el
+++ b/test/lisp/files-tests.el
@@ -1806,7 +1806,7 @@ Prompt users for any modified buffer with `buffer-offer-save' non-nil."
          ;; `save-some-buffers-default-predicate' (i.e. the 2nd element) is ignored.
          (nil save-some-buffers-root ,nb-might-save))))))
 
-(defun test-file-name-split ()
+(ert-deftest test-file-name-split ()
   (should (equal (file-name-split "foo/bar") '("foo" "bar")))
   (should (equal (file-name-split "/foo/bar") '("" "foo" "bar")))
   (should (equal (file-name-split "/foo/bar/zot") '("" "foo" "bar" "zot")))