rtprtxsend: don't start the task unless we are doing rtx
The rtxsend element can do pass-through when not enabled (no pt-map set) and in those cases there is no point in starting an additional task that does absolutely nothing.
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The rtxsend element can do pass-through when not enabled (no pt-map set) and in those cases there is no point in starting an additional task that does absolutely nothing.