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nccl_message_transfer and ring tests are overwriting in the cleanup the error value
returned from previous calls. This is making the tests quite worthless,
because if a function fails the returned error will be overwritten by the
deallocate_buffer call, so if the deallocation is successful, the tests
succeeds. This PR fixes that by using a different variable for the
return values in the cleanup and makes the test fail if either a function
call fails, or the cleanup fails, or both.
While testing this, I also noticed that we were ignoring the return value of
send_close(), so I am also fixing that.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.