BUG/MEDIUM: check: tcpcheck regression introduced by e16c1b3f

The commit e16c1b3f changed the way the function tcpcheck_get_step_id is
now called (check instead of server).
This change introduced a regression since now this function would return
0 all the time because of:
 if (check->current_step)
   return 0;

This patch fixes this issue by inversing the test: you want to return 0
only if current_step is not yet set :)

No backport is needed.
1 file changed