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Clarify why result of NoPendingTransactionProcessing is never negative

numTxsInProgress is frozen while the stream is inactive, so the two
non-atomic reads cannot produce a negative result. Every status tracked
by readyCount was previously counted in numTxsInProgress at block
receipt, and numTxsInProgress is only decremented after sendTxStatus
consumes from the queue (which decrements readyCount first).

Signed-off-by: Senthilnathan <cendhu@gmail.com>