nvme-fcloop: verify wwnn and wwpn format

The nvme host and target verify the wwnn and wwpn format via
nvme_fc_parse_traddr(). For instance, it is required that the length of
wwnn to be either 21 ("nn-0x") or 19 (nn-).

Add this verification to nvme-fcloop so that the input should always be in
hex and the length of input should always be 18.

Otherwise, the user may use e.g. 0x2 to create fcloop local port, while
0x0000000000000002 is required for nvme host and target. This makes the
requirement of format confusing.

Signed-off-by: Dongli Zhang <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Reviewed-by: James Smart <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>

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