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When failure occurs, 'ret' need be set, or may return 0 to indicate success. Previously, an error was set in errp, but 0 was returned anyway. So let bdrv_append_temp_snapshot() return an error code and use that for the bdrv_open() return value. Also, error_propagate() need be called only one time within a function. Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>