(open-tls-stream): Remove unneeded buffer contents when opening the connection.

lisp/ChangeLog

+2013-06-05  Teodor Zlatanov  <tzz@lifelogs.com>
+
+	* net/tls.el (open-tls-stream): Remove unneeded buffer contents up
+	to point when opening the connection.
+	Suggested by João Távora <joaotavora@gmail.com> in
+	<http://lists.gnu.org/archive/html/emacs-devel/2013-05/msg00464.html>.
+
 2013-06-05  Stefan Monnier  <monnier@iro.umontreal.ca>
 	* subr.el (load-history-regexp, load-history-filename-element)

lisp/net/tls.el

@@ -286,7 +286,10 @@ NOT trusted. Accept anyway? " host)))))
 			     (format "Host name in certificate doesn't \
 match `%s'. Connect anyway? " host))))))
 	(setq done nil)
-	(delete-process process)))
+	(delete-process process))
+      ;; Delete all the informational messages that could confuse
+      ;; future uses of `buffer'.
+      (delete-region (point-min) (point)))
     (message "Opening TLS connection to `%s'...%s"
 	     host (if done "done" "failed"))
     (when use-temp-buffer