output/fifo: use ssize_t for the read() result
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@ -227,10 +227,10 @@ inline void
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FifoOutput::Cancel()
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{
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char buf[FIFO_BUFFER_SIZE];
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int bytes;
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timer->Reset();
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ssize_t bytes;
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do {
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bytes = read(input, buf, FIFO_BUFFER_SIZE);
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} while (bytes > 0 && errno != EINTR);
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