90d9b6b8ac
mpfs_write_tx_fifo() gets stuck in the following case:
- CDCACM is used
- ttyACM0 is opened and then closed from the remote end,
such as Linux or Windows
- data is written into ttyACM0 from NuttX
- tx fifo will never get empty and the system is stuck
Fix this by issuing an error code if the transmit fifo doesn't
proceed as expected. The error code is then propagated into
higher level keeping the system functional.
Signed-off-by: Eero Nurkkala <eero.nurkkala@offcode.fi>
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