improve catalog debugging message patch from Rick Jones Daniel

* catalog.c: improve catalog debugging message patch from Rick Jones
Daniel
diff --git a/catalog.c b/catalog.c
index 202c288..8f8898b 100644
--- a/catalog.c
+++ b/catalog.c
@@ -1648,7 +1648,8 @@
 		    if (xmlStrEqual(sysID, cur->name)) {
 			if (xmlDebugCatalogs)
 			    xmlGenericError(xmlGenericErrorContext,
-				    "Found system match %s\n", cur->name);
+				    "Found system match %s, using %s\n",
+				            cur->name, cur->URL);
 			catal->depth--;
 			return(xmlStrdup(cur->URL));
 		    }