xhci: decouple EV_QUEUE from TD_QUEUE

EV_QUEUE must not change because an array of that size is part of live
migration data.  Hard-code current value there, so we can touch TD_QUEUE
without breaking live migration.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Message-id: 1474965172-30321-3-git-send-email-kraxel@redhat.com

hw/usb/hcd-xhci.c

@@ -49,7 +49,7 @@
 #define TD_QUEUE 24
 
 /* Very pessimistic, let's hope it's enough for all cases */
-#define EV_QUEUE (((3*TD_QUEUE)+16)*MAXSLOTS)
+#define EV_QUEUE (((3 * 24) + 16) * MAXSLOTS)
 /* Do not deliver ER Full events. NEC's driver does some things not bound
  * to the specs when it gets them */
 #define ER_FULL_HACK