net/mlx5e: Compare all fields in IPv6 address

Fix size argument in memcmp to compare whole IPv6 address.

Fixes: b3beba1fb4 ("net/mlx5e: Allow policies with reqid 0, to support IKE policy holes")
Reviewed-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Emeel Hakim <ehakim@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h

@@ -287,7 +287,7 @@ static inline bool addr6_all_zero(__be32 *addr6)
 {
 	static const __be32 zaddr6[4] = {};
 
-	return !memcmp(addr6, zaddr6, sizeof(*zaddr6));
+	return !memcmp(addr6, zaddr6, sizeof(zaddr6));
 }
 #else
 static inline void mlx5e_ipsec_init(struct mlx5e_priv *priv)