list ioapic's start and end gsi, not nrdt and ibase.

Reference: /n/atom/patch/applied2013/nixioapicfile
Date: Mon Aug 26 22:43:41 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/ioapic.c	Mon Aug 26 22:42:56 2013
+++ /sys/src/nix/k10/ioapic.c	Mon Aug 26 22:42:56 2013
@@ -297,8 +297,8 @@
 	s = "ioapic";
 	p = seprint(p, e, "%-8s ", s);
 	p = seprint(p, e, "%8ux ", i);
-	p = seprint(p, e, "%6d ", a->nrdt);
 	p = seprint(p, e, "%6d ", a->ibase);
+	p = seprint(p, e, "%6d ", a->ibase+a->nrdt-1);
 	p = seprint(p, e, "%#P ", a->paddr);
 	p = seprint(p, e, "\n");
 	return p;