block: Add error handling to bdrv_invalidate_cache()
If it returns an error, the migrated VM will not be started, but qemu exits with an error message. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NBenoit Canet <benoit@irqsave.net>
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