Paolo Bonzini 446351236b ide: simplify start_transfer callbacks
Drop the unused return value and make the callback optional.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-15 18:03:12 +01:00
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