fix sense-setting so the sense data returned to scuzz is not ~0.

Reference: /n/sources/patch/applied/devsd-setsense
Date: Thu May 10 00:07:47 CES 2007
Signed-off-by: quanstro@quanstro.net

--- /sys/src/9/port/devsd.c	Thu May 10 00:06:53 2007
+++ /sys/src/9/port/devsd.c	Thu May 10 00:06:43 2007
@@ -881,6 +881,7 @@
 	unit->sense[12] = asc;
 	unit->sense[13] = ascq;
 
+	r->status = status;
 	if(status == SDcheck && !(r->flags & SDnosense)){
 		/* request sense case from sdfakescsi */
 		len = sizeof unit->sense;