bnxt_en: Add missing skb_mark_for_recycle() in bnxt_rx_vlan()

If bnxt_rx_vlan() fails because the VLAN protocol ID is invalid,
the SKB is freed but we're missing the call to recycle it.  This
may cause the warning:

"page_pool_release_retry() stalled pool shutdown"

Add the missing skb_mark_for_recycle() in bnxt_rx_vlan().

Fixes: 86b0550 ("bnxt_en: Use the unified RX page pool buffers for XDP and non-XDP")
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: skotur-brcm

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -2015,6 +2015,7 @@ static struct sk_buff *bnxt_rx_vlan(struct sk_buff *skb, u8 cmp_type,
 	}
 	return skb;
 vlan_err:
+	skb_mark_for_recycle(skb);
 	dev_kfree_skb(skb);
 	return NULL;
 }