Remove my workaround which prevented ice(4) from getting stuck in OACTIVE.

A much simpler fix for this issue was found by yasuoka@ for vmx(4).
An equivalent fix will be applied to ice(4) shortly.

Author: stspdotname

sys/dev/pci/if_ice.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_ice.c,v 1.47 2025/06/19 09:05:03 stsp Exp $	*/
+/*	$OpenBSD: if_ice.c,v 1.48 2025/06/20 09:27:49 stsp Exp $	*/
 
 /*  Copyright (c) 2024, Intel Corporation
  *  All rights reserved.
@@ -29110,7 +29110,7 @@ ice_txeof(struct ice_softc *sc, struct ice_tx_queue *txq)
 	struct ice_tx_desc *ring, *txd;
 	struct ice_tx_map *txm;
 	bus_dmamap_t map;
-	unsigned int cons, prod, last, free;
+	unsigned int cons, prod, last;
 	unsigned int mask;
 	uint64_t dtype;
 	int done = 0;
@@ -29121,11 +29121,6 @@ ice_txeof(struct ice_softc *sc, struct ice_tx_queue *txq)
 	if (cons == prod)
 		return (0);
 
-	free = cons;
-	if (free <= prod)
-		free += txq->desc_count;
-	free -= prod;
-
 	bus_dmamap_sync(sc->sc_dmat, ICE_DMA_MAP(&txq->tx_desc_mem),
 	    0, ICE_DMA_LEN(&txq->tx_desc_mem), BUS_DMASYNC_POSTREAD);
 
@@ -29167,15 +29162,6 @@ ice_txeof(struct ice_softc *sc, struct ice_tx_queue *txq)
 
 	if (ifq_is_oactive(ifq))
 		ifq_restart(ifq);
-	else if (free <= ICE_MIN_DESC_COUNT + 1) {
-		/* XXX sometimes ring was OACTIVE but is_oactive() is false */
-		free = cons;
-		if (free <= prod)
-			free += txq->desc_count;
-		free -= prod;
-		if (free > ICE_MIN_DESC_COUNT + 1)
-			ifq_restart(ifq);
-	}
 
 	return (done);
 }