The current check sets an error but doesn't fail the command.
This may cause a problem if new connection attempt by the same URI
affects the first connection.

Signed-off-by: Yury Kotov <yury-kotov@yandex-team.ru>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>