Fix dtrace probe dist_outputv size argument

[jaher]

Fix bug where dist_outputv dtrace probe is currently using the uninitialized variable 'size'.

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CT Test Results

Tests are running... https://github.com/erlang/otp/actions/runs/2326396639

Results for commit 3f958019c1a1349ef49a4149d20b347e48d18ca1

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// Erlang/OTP Github Action Bot

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