xhci: simplify if statement to make it more readable

No functional change, De Morgan !(A && B) = (!A || !B)

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-ring.c

@@ -913,7 +913,8 @@ void xhci_stop_endpoint_command_watchdog(unsigned long arg)
 	spin_lock_irqsave(&xhci->lock, flags);
 
 	ep->stop_cmds_pending--;
-	if (!(ep->stop_cmds_pending == 0 && (ep->ep_state & EP_HALT_PENDING))) {
+
+	if (ep->stop_cmds_pending || !(ep->ep_state & EP_HALT_PENDING)) {
 		xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
 				"Stop EP timer ran, but no command pending, "
 				"exiting.");