qemu: Skip starting NBD servers for offline migration
qemu: Skip starting NBD servers for offline migration

NBD storage migration will not work with offline migration anyway and we
already checked that the user did not ask for it. Thus it doesn't make
sense to keep the code after 'done' label where we jump in case of
offline migration.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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