IEEE1394(r1137): Check to make sure we have a hostinfo in sbp2_host_reset.

drivers/ieee1394/sbp2.c

@@ -808,6 +808,7 @@ static void sbp2_host_reset(struct hpsb_host *host)
 
 	hi = hpsb_get_hostinfo(&sbp2_highlevel, host);
 
+	if (hi)
 		scsi_block_requests(hi->scsi_host);
 }