Avoid warning about long docstring lines in defcustom

* lisp/custom.el (defcustom): Avoid warning about long docstring
lines.  This was caused by the value of the defcustom being treated as
docstring due to it being wrapped in a lambda.

diff --git a/lisp/custom.el b/lisp/custom.el
index f392bd8d369f0a15f30c3a19a06d29aca5d59622..858b158051cdc4d810bc19585c01cc690ec3bcd9 100644 (file)
--- a/lisp/custom.el
+++ b/lisp/custom.el
@@ -378,7 +378,7 @@ for more information."
          ;; expression is checked by the byte-compiler, and that
          ;; lexical-binding is obeyed, so quote the expression with
          ;; `lambda' rather than with `quote'.
-         ``(funcall #',(lambda () ,standard))
+         ``(funcall #',(lambda () "" ,standard))
        `',standard)
     ,doc
     ,@args))