v3dv: Fix uninitialized variable warnings
This fixes the uninitialized variable warnings in the v3dv driver, which do not seem to be spurious (i.e. it does seem possible that control flow can result in these variables being used uninitialized).
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This fixes the uninitialized variable warnings in the v3dv driver, which do not seem to be spurious (i.e. it does seem possible that control flow can result in these variables being used uninitialized).