Fix look-up of GTP tunnel by TEI

I can't look tei by gtp-tunnel in GTPv1.
I write patch for libgtpnl.

head version

$./tools/gtp-tunnel add hoge v1 65535 65535 10.0.3.2 192.168.0.2
$./tools/gtp-tunnel list
version 1 tei 0/0 ms_addr 10.0.3.2 sgsn_addr 192.168.0.2

fixed version

$./tools/gtp-tunnel add hoge v1 65535 65535 10.0.3.2 192.168.0.2
$./tools/gtp-tunnel list
version 1 tei 65535/65535 ms_addr 10.0.3.2 sgsn_addr 192.168.0.2
diff --git a/src/gtp-genl.c b/src/gtp-genl.c
index 1e77e06..24a640d 100644
--- a/src/gtp-genl.c
+++ b/src/gtp-genl.c
@@ -119,7 +119,7 @@
 	const struct nlattr **tb = data;
 	int type = mnl_attr_get_type(attr);
 
-	if (mnl_attr_type_valid(attr, CTRL_ATTR_MAX) < 0)
+	if (mnl_attr_type_valid(attr, GTPA_MAX) < 0)
 		return MNL_CB_OK;
 
 	switch(type) {