babel: tangle works when buffer name and file name differ

Thanks to "w t" from the mailing list for reporting this bug and
  providing reproduction information.

contrib/babel/lisp/org-babel-tangle.el

@@ -71,7 +71,14 @@ specify a default export file for all source blocks.  Optional
 argument LANG can be used to limit the exported source code
 blocks by language."
   (interactive "fFile to tangle: \nP")
-  (save-window-excursion (find-file file) (org-babel-tangle target-file lang)))
+  (let ((visited-p (get-file-buffer (expand-file-name file)))
+	to-be-removed)
+    (save-window-excursion
+      (find-file file)
+      (setq to-be-removed (current-buffer))
+      (org-babel-tangle target-file lang))
+    (unless visited-p
+      (kill-buffer to-be-removed))))
 
 (defun org-babel-tangle-publish (_ filename pub-dir)
   "Tangle FILENAME and place the results in PUB-DIR."

contrib/babel/lisp/org-babel.el

@@ -562,14 +562,18 @@ with C-c C-c."
 (defmacro org-babel-map-source-blocks (file &rest body)
   "Evaluate BODY forms on each source-block in FILE."
   (declare (indent 1))
-  `(let ((visited-p (get-buffer (file-name-nondirectory ,file))))
+  `(let ((visited-p (get-file-buffer (expand-file-name ,file)))
+	 to-be-removed)
      (save-window-excursion
-       (find-file ,file) (goto-char (point-min))
+       (find-file ,file)
+       (setq to-be-removed (current-buffer))
+       (goto-char (point-min))
        (while (re-search-forward org-babel-src-block-regexp nil t)
          (goto-char (match-beginning 0))
          (save-match-data ,@body)
          (goto-char (match-end 0))))
-     (unless visited-p (kill-buffer (file-name-nondirectory ,file)))))
+     (unless visited-p
+       (kill-buffer to-be-removed))))
 
 (defun org-babel-params-from-properties (&optional lang)
   "Return an association list of any source block params which