Some early 2.x sun4c PROM will default to serial input but glass output if no

keyboard is connected but a framebuffer exists in the machine; the current
kernel console code will complain and switch to full serial, but later on
the framebuffer would incorrectly take over the console.

Correctly detect this situation and reset the `fbnode' variable. This is
an improvement of the fix which went in rev 1.54 of this file.

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