bnxt: fix a condition

This code generates as static checker warning because htons(ETH_P_IPV6)
is always true.  From the context it looks like the && was intended to
be !=.

Fixes: 94758f8d ('bnxt_en: Add GRO logic for BCM5731X chips.')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -997,7 +997,7 @@ static struct sk_buff *bnxt_gro_func_5731x(struct bnxt_tpa_info *tpa_info,
 		 * correct protocol ID, it must be a loopback packet where
 		 * the offsets are off by 4.
 		 */
-		if (proto != htons(ETH_P_IP) && proto && htons(ETH_P_IPV6))
+		if (proto != htons(ETH_P_IP) && proto != htons(ETH_P_IPV6))
 			loopback = true;
 	}
 	if (loopback) {