[libnftables PATCH 2/3] nat: xml: fix non-mandatory element

[Arturo Borrero <arturo.borrero.glez@xxxxxxxxx>]

If the node isn't present, this produces segfault.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@xxxxxxxxx>
---
 src/expr/nat.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/expr/nat.c b/src/expr/nat.c
index cd38e83..a76f5b5 100644
--- a/src/expr/nat.c
+++ b/src/expr/nat.c
@@ -258,7 +258,7 @@ static int nft_rule_expr_nat_xml_parse(struct nft_rule_expr *e, char *xml)
 	/* Get and set <sreg_addr_min_v4>. Not mandatory */
 	node = mxmlFindElement(tree, tree, "sreg_addr_min_v4", NULL, NULL,
 			       MXML_DESCEND);
-	if (node == NULL) {
+	if (node != NULL) {
 		tmp = strtoull(node->child->value.opaque, &endptr, 10);
 		if (tmp > UINT32_MAX || tmp < 0 || *endptr)
 			goto err;
@@ -270,7 +270,7 @@ static int nft_rule_expr_nat_xml_parse(struct nft_rule_expr *e, char *xml)
 	/* Get and set <sreg_addr_max_v4>. Not mandatory */
 	node = mxmlFindElement(tree, tree, "sreg_addr_max_v4", NULL, NULL,
 			       MXML_DESCEND);
-	if (node == NULL) {
+	if (node != NULL) {
 		tmp = strtoull(node->child->value.opaque, &endptr, 10);
 		if (tmp > UINT32_MAX || tmp < 0 || *endptr)
 			goto err;
@@ -282,7 +282,7 @@ static int nft_rule_expr_nat_xml_parse(struct nft_rule_expr *e, char *xml)
 	/* Get and set <sreg_proto_min>. Not mandatory */
 	node = mxmlFindElement(tree, tree, "sreg_proto_min", NULL, NULL,
 			       MXML_DESCEND);
-	if (node == NULL) {
+	if (node != NULL) {
 		tmp = strtoull(node->child->value.opaque, &endptr, 10);
 		if (tmp > UINT32_MAX || tmp < 0 || *endptr)
 			goto err;
@@ -294,7 +294,7 @@ static int nft_rule_expr_nat_xml_parse(struct nft_rule_expr *e, char *xml)
 	/* Get and set <sreg_proto_max>. Not mandatory */
 	node = mxmlFindElement(tree, tree, "sreg_proto_max", NULL, NULL,
 			       MXML_DESCEND);
-	if (node == NULL) {
+	if (node != NULL) {
 		tmp = strtoull(node->child->value.opaque, &endptr, 10);
 		if (tmp > UINT32_MAX || tmp < 0 || *endptr)
 			goto err;

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