(vc-backend-diff): Handle either string or list.

diff --git a/lisp/vc.el b/lisp/vc.el
index b76fc7de31de1e6f8ad4890ea7458548aa7e37b9..67c10a2713e45cd91b8db142e9b737b3afaa5c4a 100644 (file)
--- a/lisp/vc.el
+++ b/lisp/vc.el
@@ -1487,7 +1487,9 @@ Return nil if there is no such person."
         file
         (and oldvers (concat "-r" oldvers))
         (and newvers (concat "-r" newvers))
-        diff-switches
+        (if (listp diff-switches)
+            diff-switches
+          (list diff-switches))
   ))
 
 (defun vc-check-headers ()