More ticket #868: compilation error due to changes in pj_xml_find() function

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@2729 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip/src/pjsip-simple/pidf.c b/pjsip/src/pjsip-simple/pidf.c
index a787a53..e1e371b 100644
--- a/pjsip/src/pjsip-simple/pidf.c
+++ b/pjsip/src/pjsip-simple/pidf.c
@@ -128,7 +128,7 @@
     return pj_xml_find_next_node(pres, tuple, &TUPLE);
 }
 
-static pj_bool_t find_tuple_by_id(pj_xml_node *node, const void *id)
+static pj_bool_t find_tuple_by_id(const pj_xml_node *node, const void *id)
 {
     return pj_xml_find_attr(node, &ID, (const pj_str_t*)id) != NULL;
 }