Removes invalid use of while loop in WebRtcAudioDeviceImpl::RenderData().
Removes invalid use of while loop in WebRtcAudioDeviceImpl::RenderData().

Follow-up task on https://codereview.chromium.org/139303016/

BUG=264611

Review URL: https://codereview.chromium.org/1654833004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#372969}

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