i40e: fix spelling mistake in fall-through annotation

Replace "fall though" with a proper "fall through" annotation.

This fix is part of the ongoing efforts to enabling -Wimplicit-fallthrough

Addresses-Coverity-ID: 1446584 ("Missing break in switch")

---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 37bd4e5..821384c 100644
@@ -1715,7 +1715,7 @@ static inline void i40e_rx_checksum(struct i40e_vsi *vsi,
 	case I40E_RX_PTYPE_INNER_PROT_UDP:
 	case I40E_RX_PTYPE_INNER_PROT_SCTP:
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
-		/* fall though */
+		/* fall through */
 	default:
 		break;
 	}

2.7.4