org.el (org-entry-get-with-inheritance): Remove wrong quote

* org.el (org-entry-get-with-inheritance): Remove wrong quote.

lisp/org.el

@@ -15462,7 +15462,7 @@ However, if LITERAL-NIL is set, return the string value \"nil\" instead."
 	(widen)
 	(catch 'ex
 	  (while t
-	    (when (setq tmp (org-entry-get nil property nil 'literal-nil))
+	    (when (setq tmp (org-entry-get nil property nil literal-nil))
 	      (or (ignore-errors (org-back-to-heading t))
 		  (goto-char (point-min)))
 	      (move-marker org-entry-property-inherited-from (point))