xhci: Remove dead code in xhci_move_dequeue_past_td()

This codepath is trivially dead, since the function is never called with
a non-NULL td (the only callsite is immediately preceded by a NULL guard).

[remove unused label 'deq_found' -Mathias]
Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20240626124835.1023046-2-mathias.nyman@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-ring.c

@@ -654,25 +654,6 @@ static int xhci_move_dequeue_past_td(struct xhci_hcd *xhci,
 			  stream_id);
 		return -ENODEV;
 	}
-	/*
-	 * A cancelled TD can complete with a stall if HW cached the trb.
-	 * In this case driver can't find td, but if the ring is empty we
-	 * can move the dequeue pointer to the current enqueue position.
-	 * We shouldn't hit this anymore as cached cancelled TRBs are given back
-	 * after clearing the cache, but be on the safe side and keep it anyway
-	 */
-	if (!td) {
-		if (list_empty(&ep_ring->td_list)) {
-			new_seg = ep_ring->enq_seg;
-			new_deq = ep_ring->enqueue;
-			new_cycle = ep_ring->cycle_state;
-			xhci_dbg(xhci, "ep ring empty, Set new dequeue = enqueue");
-			goto deq_found;
-		} else {
-			xhci_warn(xhci, "Can't find new dequeue state, missing td\n");
-			return -EINVAL;
-		}
-	}
 
 	hw_dequeue = xhci_get_hw_deq(xhci, dev, ep_index, stream_id);
 	new_seg = ep_ring->deq_seg;
@@ -709,8 +690,6 @@ static int xhci_move_dequeue_past_td(struct xhci_hcd *xhci,
 
 	} while (!cycle_found || !td_last_trb_found);
 
-deq_found:
-
 	/* Don't update the ring cycle state for the producer (us). */
 	addr = xhci_trb_virt_to_dma(new_seg, new_deq);
 	if (addr == 0) {