bug#29977: gnutls-verify-error does not allow matching hostnames

[Robert Pluim]

(this is emacs-26)

Given a gnutls-verify-error of

'(("news.gmane.org" nil)
  (".*" (:trustfiles :hostname)))

gnutls-boot-parameters will always use (:trustfiles :hostname) even
though the intent is to turn off verification for news.gmane.org.
Proposed patch converts this to first-match, which I think matches the
intent of the variable.

>From 2935008e42d956607bf1893ea6507db6202b3eb1 Mon Sep 17 00:00:00 2001
From: Robert Pluim <rpluim@gmail.com>
Date: Thu, 4 Jan 2018 16:12:47 +0100
Subject: [PATCH] Change gnutls-verify-error to be first-match

* lisp/net/gnutls.el (gnutls-boot-parameters): Convert to
first-match for gnutls-verify-error rather than any-match
---
 lisp/net/gnutls.el | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/lisp/net/gnutls.el b/lisp/net/gnutls.el
index 5afd5c5804..c8f4824b53 100644
--- a/lisp/net/gnutls.el
+++ b/lisp/net/gnutls.el
@@ -282,13 +282,9 @@ gnutls-log-level
                              t)
                             ;; if a list, look for hostname matches
                             ((listp gnutls-verify-error)
-                             (apply 'append
-                                    (mapcar
-                                     (lambda (check)
-                                       (when (string-match (nth 0 check)
-                                                           hostname)
-                                         (nth 1 check)))
-                                     gnutls-verify-error)))
+                             (cadr (cl-find-if #'(lambda (x)
+                                                   (string-match (car x) 
hostname))
+                                               gnutls-verify-error)))
                             ;; else it's nil
                             (t nil))))
          (min-prime-bits (or min-prime-bits gnutls-min-prime-bits)))
-- 
2.16.0.rc0