dev/pipe: call rx_indicate the time we resume reader
Some reader(FinSh again) would like to block on a semaphore which is released in rx_indicate. So we should invoke rx_indicate in _rt_pipe_resume_reader.
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Some reader(FinSh again) would like to block on a semaphore which is released in rx_indicate. So we should invoke rx_indicate in _rt_pipe_resume_reader.