snmp: fix some left over of snmp stats

Fengguang reported the following sparse warning:

>> net/ipv6/proc.c:198:41: sparse: incorrect type in argument 1 (different address spaces)
net/ipv6/proc.c:198:41: expected void [noderef] <asn:3>*mib
net/ipv6/proc.c:198:41: got void [noderef] <asn:3>**pcpumib

Fixes: commit 698365fa1874aa7635d51667a3 (net: clean up snmp stats code)
Reported-by: Fengguang Wu <[e-mail]>
Cc: David S. Miller <[e-mail]>
Signed-off-by: Cong Wang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv6/proc.c

···
 /* can be called either with percpu mib (pcpumib != NULL),
  * or shared one (smib != NULL)
  */
-static void snmp6_seq_show_item(struct seq_file *seq, void __percpu **pcpumib,
+static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
 				atomic_long_t *smib,
 				const struct snmp_mib *itemlist)
 {
···
 
 	snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
 			    snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
-	snmp6_seq_show_item(seq, (void __percpu **)net->mib.icmpv6_statistics,
+	snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
 			    NULL, snmp6_icmp6_list);
 	snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
-	snmp6_seq_show_item(seq, (void __percpu **)net->mib.udp_stats_in6,
+	snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
 			    NULL, snmp6_udp6_list);
-	snmp6_seq_show_item(seq, (void __percpu **)net->mib.udplite_stats_in6,
+	snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
 			    NULL, snmp6_udplite6_list);
 	return 0;
 }

net/sctp/proc.c

···
 
 	for (i = 0; sctp_snmp_list[i].name != NULL; i++)
 		seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name,
-			   snmp_fold_field((void __percpu **)net->sctp.sctp_statistics,
+			   snmp_fold_field(net->sctp.sctp_statistics,
 				      sctp_snmp_list[i].entry));
 
 	return 0;