bonding: don't use bond_next_slave() in bond_info_seq_next()

We don't need the circular loop there and it's the only current user of
bond_next_slave() - so just use the standard bond_for_each_slave().

CC: Jay Vosburgh <fubar@us.ibm.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_procfs.c

@@ -31,17 +31,25 @@ static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	struct bonding *bond = seq->private;
-	struct slave *slave = v;
+	struct list_head *iter;
+	struct slave *slave;
+	bool found = false;
 
 	++*pos;
 	if (v == SEQ_START_TOKEN)
 		return bond_first_slave(bond);
 
-	if (bond_is_last_slave(bond, slave))
+	if (bond_is_last_slave(bond, v))
 		return NULL;
-	slave = bond_next_slave(bond, slave);
 
+	bond_for_each_slave(bond, slave, iter) {
+		if (found)
 			return slave;
+		if (slave == v)
+			found = true;
+	}
+
+	return NULL;
 }
 
 static void bond_info_seq_stop(struct seq_file *seq, void *v)