Fix posix stdin read error handling#463
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getByteFromStdin never returns -1 because it checks the size of the span passed by value instead of the return value of the uart read. Use ssize_t for the ::read() result in Uart::read to avoid silent conversion of -1 to a large size_t.
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getByteFromStdin never returns -1 because it checks the size of the span passed by value instead of the return value of the uart read.
Use ssize_t for the ::read() result in Uart::read to avoid silent conversion of -1 to a large size_t.