testapi.c: Initialize catalog early

Avoid leak reports when testing --with-mem-debug.

testapi.c

@@ -17,6 +17,7 @@
 #include <stdlib.h> /* for putenv() */
 #include <string.h>
 #include <libxml/xmlerror.h>
+#include <libxml/catalog.h>
 #include <libxml/relaxng.h>
 
 
@@ -143,6 +144,9 @@ int main(int argc, char **argv) {
     memset(longtab, 0, sizeof(longtab));
 
     xmlInitParser();
+#ifdef LIBXML_CATALOG_ENABLED
+    xmlInitializeCatalog();
+#endif
 #ifdef LIBXML_SCHEMAS_ENABLED
     xmlRelaxNGInitTypes();
 #endif
@@ -178,7 +182,6 @@ int main(int argc, char **argv) {
 
 #include <libxml/HTMLparser.h>
 #include <libxml/HTMLtree.h>
-#include <libxml/catalog.h>
 #include <libxml/chvalid.h>
 #include <libxml/dict.h>
 #include <libxml/encoding.h>