rdatomic: Fix var name typo in rd_atomic32_set

[Richard Lavoie (darkrift)]

There is a typo in the variable name used to retrieve the member val of

[Copilot]

Pull request overview

This PR fixes a typo in the rd_atomic32_set function where the variable name was incorrectly specified as rd instead of ra when retrieving the current value.

Key Changes

• Corrected variable name from rd->val to ra->val in the rd_atomic32_set function

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[Tim Hung (AvocadosConstant)]

Also ran into this, was going to enter in the same fix. Can confirm that this fix is required for that conditional branch.