net: hns: fix unsigned comparison to less than zero

Currently mskid is unsigned and hence comparisons with negative
error return values are always false. Fix this by making mskid an
int.

Fixes: f058e46 ("net: hns: fix ICMP6 neighbor solicitation messages discard problem")
Addresses-Coverity: ("Operands don't affect result")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns/hns_dsaf_main.c

@@ -2769,7 +2769,7 @@ static void set_promisc_tcam_enable(struct dsaf_device *dsaf_dev, u32 port)
 	struct hns_mac_cb *mac_cb;
 	u8 addr[ETH_ALEN] = {0};
 	u8 port_num;
-	u16 mskid;
+	int mskid;
 
 	/* promisc use vague table match with vlanid = 0 & macaddr = 0 */
 	hns_dsaf_set_mac_key(dsaf_dev, &mac_key, 0x00, port, addr);