[NETFILTER]: Make use of ipt_register_target() return values.

net/ipv4/netfilter/ipt_CLASSIFY.c

@@ -71,10 +71,7 @@ static struct ipt_target ipt_classify_reg = {
 
 static int __init init(void)
 {
-	if (ipt_register_target(&ipt_classify_reg))
-		return -EINVAL;
-
-	return 0;
+	return ipt_register_target(&ipt_classify_reg);
 }
 
 static void __exit fini(void)

net/ipv4/netfilter/ipt_DSCP.c

@@ -91,10 +91,7 @@ static struct ipt_target ipt_dscp_reg = {
 
 static int __init init(void)
 {
-	if (ipt_register_target(&ipt_dscp_reg))
-		return -EINVAL;
-
-	return 0;
+	return ipt_register_target(&ipt_dscp_reg);
 }
 
 static void __exit fini(void)

net/ipv4/netfilter/ipt_ECN.c

@@ -155,10 +155,7 @@ static struct ipt_target ipt_ecn_reg = {
 
 static int __init init(void)
 {
-	if (ipt_register_target(&ipt_ecn_reg))
-		return -EINVAL;
-
-	return 0;
+	return ipt_register_target(&ipt_ecn_reg);
 }
 
 static void __exit fini(void)

net/ipv4/netfilter/ipt_LOG.c

@@ -404,10 +404,7 @@ static struct ipt_target ipt_log_reg = {
 
 static int __init init(void)
 {
-	if (ipt_register_target(&ipt_log_reg))
-		return -EINVAL;
-
-	return 0;
+	return ipt_register_target(&ipt_log_reg);
 }
 
 static void __exit fini(void)

net/ipv4/netfilter/ipt_MARK.c

@@ -59,10 +59,7 @@ static struct ipt_target ipt_mark_reg = {
 
 static int __init init(void)
 {
-	if (ipt_register_target(&ipt_mark_reg))
-		return -EINVAL;
-
-	return 0;
+	return ipt_register_target(&ipt_mark_reg);
 }
 
 static void __exit fini(void)

net/ipv4/netfilter/ipt_REJECT.c

@@ -449,9 +449,7 @@ static struct ipt_target ipt_reject_reg = {
 
 static int __init init(void)
 {
-	if (ipt_register_target(&ipt_reject_reg))
-		return -EINVAL;
-	return 0;
+	return ipt_register_target(&ipt_reject_reg);
 }
 
 static void __exit fini(void)

net/ipv4/netfilter/ipt_TOS.c

@@ -84,10 +84,7 @@ static struct ipt_target ipt_tos_reg = {
 
 static int __init init(void)
 {
-	if (ipt_register_target(&ipt_tos_reg))
-		return -EINVAL;
-
-	return 0;
+	return ipt_register_target(&ipt_tos_reg);
 }
 
 static void __exit fini(void)