bug#13706: 24.3.50; network-stream-command may return nil, not always a string

[Didier Verna <didier@didierverna.net>]

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network-stream-get-response returns nil if the server connection is
lost, hence network-stream-command does the same. There was one instance
of a blind string-match against the return value which would fail with a
STRINGP NIL error from time to time.

The attached patch fixes this.

2013-02-13  Didier Verna  <didier@didierverna.net>

	* net/network-stream.el (network-stream-open-starttls): Check that
	the response to the starttls-command is not nil before
	string-match'ing it.



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diff --git a/lisp/net/network-stream.el b/lisp/net/network-stream.el
index 8cf9ec6..fd21997 100644
--- a/lisp/net/network-stream.el
+++ b/lisp/net/network-stream.el
@@ -262,8 +262,9 @@ STARTTLS upgrades even if Emacs doesn't have built-in TLS functionality.
 	;; EHLO for SMTP.
 	(when (plist-get parameters :always-query-capabilities)
 	  (network-stream-command stream capability-command eo-capa)))
-      (when (string-match success-string
-			  (network-stream-command stream starttls-command eoc))
+      (when (let ((response
+		   (network-stream-command stream starttls-command eoc)))
+	      (and response (string-match success-string response)))
 	;; The server said it was OK to begin STARTTLS negotiations.
 	(if builtin-starttls
 	    (let ((cert (network-stream-certificate host service parameters)))

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