test fix for a@9srv

Reference: /n/atom/patch/applied/testahci4096
Date: Wed Jan 22 02:44:46 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/9/pc/sdiahci.c	Wed Jan 22 02:44:34 2014
+++ /sys/src/9/pc/sdiahci.c	Wed Jan 22 02:44:35 2014
@@ -1519,7 +1519,7 @@
 	flags = Lpref;
 	if(rw == SDwrite)
 		flags |= Lwrite;
-	mkalist(m, flags, data, 512*n);
+	mkalist(m, flags, data, n);
 	return l;
 }
 
@@ -1750,7 +1750,7 @@
 		if(n > max)
 			n = max;
 		qlock(&d->portm);
-		ahcibuild(&d->portm, rw, data, n, lba);
+		ahcibuild(&d->portm, rw, data, n*u->secsize, lba);
 		status = io(d, Pdma, 5000, 0);
 		qunlock(&d->portm);
 		switch(status){