ice: fix incorrect counter for buffer allocation failures

Currently, the driver increments `alloc_page_failed` when buffer allocation fails
in `ice_clean_rx_irq()`. However, this counter is intended for page allocation
failures, not buffer allocation issues.

This patch corrects the counter by incrementing `alloc_buf_failed` instead,
ensuring accurate statistics reporting for buffer allocation failures.

Fixes: 2fba7dc ("ice: Add support for XDP multi-buffer on Rx side")
Reported-by: Jacob Keller <[email protected]>
Suggested-by: Paul Menzel <[email protected]>
Signed-off-by: Michal Kubiak <[email protected]>
Reviewed-by: Paul Menzel <[email protected]>
Reviewed-by: Jason Xing <[email protected]>
Reviewed-by: Aleksandr Loktionov <[email protected]>
Tested-by: Priya Singh <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

Author: michalQb

drivers/net/ethernet/intel/ice/ice_txrx.c

@@ -1352,7 +1352,7 @@ static int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
 			skb = ice_construct_skb(rx_ring, xdp);
 		/* exit if we failed to retrieve a buffer */
 		if (!skb) {
-			rx_ring->ring_stats->rx_stats.alloc_page_failed++;
+			rx_ring->ring_stats->rx_stats.alloc_buf_failed++;
 			xdp_verdict = ICE_XDP_CONSUMED;
 		}
 		ice_put_rx_mbuf(rx_ring, xdp, &xdp_xmit, ntc, xdp_verdict);