REVIEW/TEST: tty.patch

[Poul-Henning Kamp]

http://phk.freebsd.dk/patch/tty.patch

This patch adds asserts that dev_t's passed to ttyread(), ttywrite(),
ttypoll() and ttykqwrite() have (d_flags & D_TTY).

Add missing D_TTY flags to various drivers.

Make ttyread(), ttywrite(), ttypoll() and ttykqwrite() the default
cdevsw methods for D_TTY drivers.

Remove now unneeded initializations for these methods in relevant
drivers.


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