Johan Hovold 8da636d9b5 USB: ftdi_sio: optimise chars_in_buffer
No need to check hardware buffers when we know that the software
buffers are non-empty.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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