[SCTP]: Use snmp_fold_field instead of a homebrew analogue.

SCPT already depends in INET, so this doesn't create additional
dependencies.

Signed-off-by: Pavel Emelyanov <[e-mail]>
Acked-by: Vlad Yasevich <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/sctp/proc.c

···
 #include <linux/seq_file.h>
 #include <linux/init.h>
 #include <net/sctp/sctp.h>
+#include <net/ip.h> /* for snmp_fold_field */
 
 static struct snmp_mib sctp_snmp_list[] = {
 	SNMP_MIB_ITEM("SctpCurrEstab", SCTP_MIB_CURRESTAB),
···
 	SNMP_MIB_SENTINEL
 };
 
-/* Return the current value of a particular entry in the mib by adding its
- * per cpu counters.
- */
-static unsigned long
-fold_field(void *mib[], int nr)
-{
-	unsigned long res = 0;
-	int i;
-
-	for_each_possible_cpu(i) {
-		res +=
-		    *((unsigned long *) (((void *) per_cpu_ptr(mib[0], i)) +
-					 sizeof (unsigned long) * nr));
-		res +=
-		    *((unsigned long *) (((void *) per_cpu_ptr(mib[1], i)) +
-					 sizeof (unsigned long) * nr));
-	}
-	return res;
-}
-
 /* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */
 static int sctp_snmp_seq_show(struct seq_file *seq, void *v)
 {
···
 
 	for (i = 0; sctp_snmp_list[i].name != NULL; i++)
 		seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name,
-			   fold_field((void **)sctp_statistics,
+			   snmp_fold_field((void **)sctp_statistics,
 				      sctp_snmp_list[i].entry));
 
 	return 0;