xhci: drop unused comp_xfer field

Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Message-id: 1474965172-30321-4-git-send-email-kraxel@redhat.com

hw/usb/hcd-xhci.c

@@ -386,7 +386,6 @@ struct XHCIEPContext {
 
     XHCIRing ring;
     unsigned int next_xfer;
-    unsigned int comp_xfer;
     XHCITransfer transfers[TD_QUEUE];
     XHCITransfer *retry;
     EPType type;