misc: adjust to structured error callback argument change in libxml2 2.12 (#86080)

NEWS

@@ -9,6 +9,8 @@ Future
 - Annotate lasso_*_signature_method functions with LASSO_EXPORT (#86076)
 - Fix implicit function declaration errors, patch provided by Rob Crittenden
   from RedHat (#85340)
+- Adjust to structured error callback argument change in libxml2 2.12, patch
+  provided by Florian Wiemer of RedHat (#86080)
 
 2.8.2 - March 14th 2023
 -----------------------

lasso/lasso.c

@@ -138,7 +138,13 @@ DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 #include "types.c"
 
 static void
-lasso_xml_structured_error_func(G_GNUC_UNUSED void *user_data, xmlErrorPtr error)
+lasso_xml_structured_error_func(G_GNUC_UNUSED void *user_data,
+#if LIBXML_VERSION >= 21200
+                                        const xmlError *error
+#else
+                                        xmlErrorPtr error
+#endif
+				)
 {
 	g_log("libxml2", G_LOG_LEVEL_DEBUG, "libxml2: %s", error->message);
 }

lasso/xml/tools.c

@@ -1450,7 +1450,14 @@ lasso_concat_url_query(const char *url, const char *query)
 	}
 }
 
-static void structuredErrorFunc (void *userData, xmlErrorPtr error) {
+static void structuredErrorFunc (void *userData,
+#if LIBXML_VERSION >= 21200
+                                        const xmlError *error
+#else
+                                        xmlErrorPtr error
+#endif
+				 )
+{
 		*(int*)userData = error->code;
 }