The OF_test_method() function takes an instance handle, not a phandle,
and returns 0 on success.
Pointed out by Mark Cave-Ayland.
Remove now unneeded bsd.kinc.mk.
Fix pread/pwrite syscalls which need a 64bit offset argument.
Regen for pread/pwrite 64bit offset argument.
Adjust pread/pwrite signature to match reality.
Regen for pread/pwrite signature.
Make this compile/work with PARANOIADIAG
open the tty with O_RDWR|O_NONBLOCK.  it seems valid to ask for
write permission when we're setting flags, and ucom(4) has an
existing workaround for a bug when O_RDWR is not used, and thus
ttyflags would not work for ucom devices.
remove hack for PR/42848