Fix for non-blocking serial write result code

[Dan Jakubiec]

Attached for your review is a fix for non-blocking serial writes. 
Currently, if the output stream on a non-blocking serial device cannot
accept any data, serial_write() will return ENOERR with 0 bytes
written.

The correct behavior is for serial_write() to return EAGAIN.  This bug
looks like a copy-paste error that was introduce in rev 1.18 of
serial.c.

Thanks,

--
Dan Jakubiec
Systech Corp

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