nvme: don't return an error from nvme_configure_metadata

When a fabrics controller claims to support an invalidate metadata
configuration we already warn and disable metadata support.  No need to
also return an error during revalidation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Tested-by: Kanchan Joshi <joshi.k@samsung.com>