panic after xdm is started

[Matthew Dillon]

    This should be fixed momentarily.  I just have to test it.  The
    problem is the console intercept that X/xdm does.  This causes
    kprintf()'s to run through the constty and if the kprintf() is
    made from a hard code section (which is a set of assertions that
    I added recently) then Ka-Boom.

    I'm changing it to only use the console tty if it can get the
    tty_token non-blocking.  Certainly this is not perfect, and if
    it isn't good enough I'll remove the console intercept entirely
    (which was a bad idea anyway, long ago).

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>