lp: too large subtraction on unsigned?

[Roel Kluin]

vi drivers/char/lp.c +705

note that count is unsigned, and we do the loop:

do {
	if (canwrite > 0) {
		...
		count -= written;
	}
	if (lf && canwrite <= 0) {
		...
		count--;
		...
	}
} while (count > 0 && (CONSOLE_LP_STRICT || written > 0));

Isn't this wrong?

Roel
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