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devaoe: fix unit numbering for Qdevlinkdir

a side effect of 3c77cd3ae664 changed the unit ordering to start at one, so fix the condition accordingly.

--- a/sys/src/9/port/devaoe.c

+++ b/sys/src/9/port/devaoe.c

@@ -949,7 +949,7 @@

 		return unitgen(c, TYPE(c->qid), dp);

 	case Qdevlinkdir:

 		i = UNIT(c->qid);

-		if(i >= Maxunits || i >= units.ref)

+		if(i > Maxunits || i > units.ref)

 			return -1;

 		d = unit2dev(i);

 		if(s == DEVDOTDOT){