Don't return in emacs_gnutls_handshake without an explicit value.

* gnutls.c (emacs_gnutls_handshake): Return an error if we're not
supposed to be handshaking.
Reported by Paul Eggert <eggert@cs.ucla.edu>.

src/ChangeLog

+2011-04-26  Teodor Zlatanov  <tzz@lifelogs.com>
+
+	* gnutls.c (emacs_gnutls_handshake): Return an error if we're not
+	supposed to be handshaking.
+	Reported by Paul Eggert <eggert@cs.ucla.edu>.
+
 2011-04-26  Daniel Colascione <dan.colascione@gmail.com>
 
 	* lisp.h (Qdebug): List symbol.

src/gnutls.c

@@ -74,7 +74,7 @@ emacs_gnutls_handshake (struct Lisp_Process *proc)
   int ret;
 
   if (proc->gnutls_initstage < GNUTLS_STAGE_HANDSHAKE_CANDO)
-    return;
+    return -1;
 
   if (proc->gnutls_initstage < GNUTLS_STAGE_TRANSPORT_POINTERS_SET)
     {