nbd-client: Fix error message typos
Provide missing spaces that are required when using string concatenation to break error messages across source lines. Introduced in commit f140e300. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20171108215703.9295-2-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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