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block: Add return value for bdrv_flush_all()
bdrv_flush() can fail, and bdrv_flush_all() should return an error as well if this happens for a block device. It returns the first error return now, but still at least tries to flush the remaining devices even in error cases. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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