messages: Set signature state explicitly

In ssh_message_new(), initialize msg->auth_request.signature_state
explicitly for better readability.

Fixes T194

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 553eab748a)

src/messages.c

@@ -71,6 +71,9 @@ static ssh_message ssh_message_new(ssh_session session)
     }
     msg->session = session;
 
+    /* Set states explicitly */
+    msg->auth_request.signature_state = SSH_PUBLICKEY_STATE_NONE;
+
     return msg;
 }