xhci: remove unused parameter 'xhci' in function xhci_handshake().

Parameter 'xhci' is no longer be used in function xhci_handshake(),
just remove it.

Signed-off-by: Lin Wang <lin.x.wang@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index e692e76..c84a959 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -299,7 +299,7 @@
 	 * seconds), then it should assume that the there are
 	 * larger problems with the xHC and assert HCRST.
 	 */
-	ret = xhci_handshake(xhci, &xhci->op_regs->cmd_ring,
+	ret = xhci_handshake(&xhci->op_regs->cmd_ring,
 			CMD_RING_RUNNING, 0, 5 * 1000 * 1000);
 	if (ret < 0) {
 		xhci_err(xhci, "Stopped the command ring failed, "