snmp6: remove IPSTATS_MIB_CSUMERRORS

This stat is not relevant in IPv6, there is no checksum in IPv6 header.
Just leave a comment to explain the hole.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/proc.c

@@ -90,7 +90,7 @@ static const struct snmp_mib snmp6_ipstats_list[] = {
 	SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
 	SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
 	SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
-	SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),
+	/* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */
 	SNMP_MIB_SENTINEL
 };