client: Reset pending_call_state on disconnect

Fixes T251

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>

src/client.c

@@ -724,6 +724,7 @@ error:
     }
     session->opts.fd = SSH_INVALID_SOCKET;
     session->session_state = SSH_SESSION_STATE_DISCONNECTED;
+    session->pending_call_state = SSH_PENDING_CALL_NONE;
 
     while ((it = ssh_list_get_iterator(session->channels)) != NULL) {
         ssh_channel_do_free(ssh_iterator_value(ssh_channel, it));