broke shutdown by accident. This fixes it.

Reference: /n/patches.lsub.org/patch/fixshutdown
Date: Thu Jun 14 12:18:50 CES 2012
Signed-off-by: paurea@lsub.org

--- /sys/src/nix/k10/main.c	Thu Jun 14 09:36:23 2012
+++ /sys/src/nix/k10/main.c	Thu Jun 14 12:16:12 2012
@@ -538,7 +538,7 @@
 	else if(m->machno == 0 && m->nixrole == NIXUC)
 		active.ispanic = 0;
 	once = m->nixrole != NIXUC;
-	acmodeset(m->nixrole);
+	acmodeset(NIXUC);
 	active.exiting = 1;
 	unlock(&active);