Race VT+X11 on -current

[Hans Petter Selasky]

Hi,

I have a fix, attached.

I'll just throw this in if nobody objects. Seems like a trivial issue:

Prevent switching to NULL or own window in the "vt_proc_window_switch"
function. This fixes an issue where X11 keyboard input can appear
stuck. The cause of the problem is a duplicate TTY device window
switch IOCTL during boot, which leaves the "vt_switch_timer" running,
because the current window is already selected. While at it factor out
some NULL checks.

PR:		200032
Reported by:	multiple people
MFC after:	1 week

--HPS
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