Require that the buffer that we're trying to patch exist

* lisp/vc/ediff.el (ediff-patch-buffer): Require that the
buffer that we're trying to patch exist (bug#21852).

diff --git a/lisp/vc/ediff.el b/lisp/vc/ediff.el
index e5e16a12f967b32daa3b36eb472d5b47dfef6bea..be4ced9b55f3d5eb6120c13e4fcb9f6e5587cd7f 100644 (file)
--- a/lisp/vc/ediff.el
+++ b/lisp/vc/ediff.el
@@ -1367,7 +1367,8 @@ buffer. If odd -- assume it is in a file."
     (require 'ediff-ptch)
     (setq patch-buf
          (ediff-get-patch-buffer
-          (if arg (prefix-numeric-value arg)) patch-buf))
+          (if arg (prefix-numeric-value arg))
+           (get-buffer patch-buf)))
     (setq source-dir (cond (ediff-use-last-dir ediff-last-dir-patch)
                           ((and (not ediff-patch-default-directory)
                                 (buffer-file-name patch-buf))