netfilter: Remove uses of seq_<foo> return values

The seq_printf/seq_puts/seq_putc return values, because they
are frequently misused, will eventually be converted to void.

See: commit 1f33c41c ("seq_file: Rename seq_overflow() to
     seq_has_overflowed() and make public")

Miscellanea:

o realign arguments
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c

@@ -300,7 +300,9 @@ static int exp_seq_show(struct seq_file *s, void *v)
 		    __nf_ct_l3proto_find(exp->tuple.src.l3num),
 		    __nf_ct_l4proto_find(exp->tuple.src.l3num,
 					 exp->tuple.dst.protonum));
-	return seq_putc(s, '\n');
+	seq_putc(s, '\n');
+
+	return 0;
 }
 
 static const struct seq_operations exp_seq_ops = {

net/netfilter/nf_conntrack_acct.c

@@ -47,9 +47,11 @@ seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
 		return 0;
 
 	counter = acct->counter;
-	return seq_printf(s, "packets=%llu bytes=%llu ",
+	seq_printf(s, "packets=%llu bytes=%llu ",
 		   (unsigned long long)atomic64_read(&counter[dir].packets),
 		   (unsigned long long)atomic64_read(&counter[dir].bytes));
+
+	return 0;
 };
 EXPORT_SYMBOL_GPL(seq_print_acct);
 

net/netfilter/nf_conntrack_expect.c

@@ -561,7 +561,9 @@ static int exp_seq_show(struct seq_file *s, void *v)
 				   helper->expect_policy[expect->class].name);
 	}
 
-	return seq_putc(s, '\n');
+	seq_putc(s, '\n');
+
+	return 0;
 }
 
 static const struct seq_operations exp_seq_ops = {

net/netfilter/nfnetlink_log.c

@@ -998,11 +998,13 @@ static int seq_show(struct seq_file *s, void *v)
 {
 	const struct nfulnl_instance *inst = v;
 
-	return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
+	seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
 		   inst->group_num,
 		   inst->peer_portid, inst->qlen,
 		   inst->copy_mode, inst->copy_range,
 		   inst->flushtimeout, atomic_read(&inst->use));
+
+	return 0;
 }
 
 static const struct seq_operations nful_seq_ops = {