plain 0 should be used. This happens to work because we #define
NULL to 0, but is stylistically wrong and can cause problems
for people trying to port bits of code to other environments.
PR: 2752
Submitted by: Arne Henrik Juul <arnej@imf.unit.no>
but termios speed range is [0..115200]. Of cource ospeed initialized
with wrong value too which cann affects terminals with padding, fixed.
57600,115200 added.
