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migration/channel-block: fix return value for qio_channel_block_{read…
…v,writev} in the error case. The documentation in include/io/channel.h states that -1 or QIO_CHANNEL_ERR_BLOCK should be returned upon error. Simply passing along the return value from the bdrv-functions has the potential to confuse the call sides. Non-blocking mode is not implemented currently, so -1 it is. Signed-off-by: Fiona Ebner <f.ebner@proxmox.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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