ixgbe: on recv increment rx.ring->stats.yields

It seem to be non intentionally changed to Tx in
commit adc810900a ("ixgbe: Refactor busy poll socket code to address
multiple issues")

Lock is taken from ixgbe_low_latency_recv, and there under this
lock we use ixgbe_clean_rx_irq so it looks wrong for me to increment
Tx counter.

Yield stats can be shown through ethtool:
ethtool -S enp129s0 | grep yield

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe.h

@@ -456,7 +456,7 @@ static inline bool ixgbe_qv_lock_poll(struct ixgbe_q_vector *q_vector)
 				IXGBE_QV_STATE_POLL);
 #ifdef BP_EXTENDED_STATS
 	if (rc != IXGBE_QV_STATE_IDLE)
-		q_vector->tx.ring->stats.yields++;
+		q_vector->rx.ring->stats.yields++;
 #endif
 	return rc == IXGBE_QV_STATE_IDLE;
 }