[libnftables PATCH] build: fix build error

[Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>]

This declaration was missing and is needed in case you compile libnftables
without XML parsing support.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
---
 src/expr/data_reg.h |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/expr/data_reg.h b/src/expr/data_reg.h
index f41a483..98c3a4c 100644
--- a/src/expr/data_reg.h
+++ b/src/expr/data_reg.h
@@ -23,6 +23,10 @@ union nft_data_reg {
 #define json_t void
 #endif
 
+#ifndef XML_PARSING
+#define mxml_node_t void
+#endif
+
 int nft_data_reg_snprintf(char *buf, size_t size, union nft_data_reg *reg,
                         uint32_t output_format, uint32_t flags, int reg_type);
 int nft_data_reg_xml_parse(union nft_data_reg *reg, mxml_node_t *tree);