[PATCH nvme-cli] fabrics: fix segfault when -t <transport> is not passed

[Chaitanya Kulkarni]

On 8/19/20 03:37, Sagi Grimberg wrote:
> Need to check if transport was provided before we derefernce
> it.
> 
> Fixes: 9da606b4afcc ("fabrics: allow traddr to be host name for ip based transports")
> Signed-off-by: Sagi Grimberg<sagi at grimberg.me>

Looks good.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>