nvme-fabrics: crash at nvme connect-all

[Steve Wise]

> 
> Does Sagi's patch help?
> 
> Author: Sagi Grimberg <sagi at grimberg.me>
> Date:   Thu Jun 9 13:20:09 2016 -0700
> 
>     fabrics: Don't directly free opts->host
> 
>     It might be the default host, so we need to call
>     nvmet_put_host (which is safe against NULL lucky for
>     us).
> 
>     Reported-by: Alexander Nezhinsky <alexander.nezhinsky at excelero.com>
>     Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
> 

Yes!  Failures recover and subsequent connects work! 

Thanks for the help Ming!  Sorry I'm finding already fixed problems. :(