Suppress compiler warning.

src/backend/utils/adt/xml.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/backend/utils/adt/xml.c,v 1.61 2007/11/27 12:21:05 petere Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/adt/xml.c,v 1.62 2007/11/27 18:13:01 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -536,7 +536,7 @@ xmltotext(PG_FUNCTION_ARGS)
 	xmltype    *data = PG_GETARG_XML_P(0);
 
 	/* It's actually binary compatible. */
-	return (text *) data;
+	PG_RETURN_TEXT_P((text *) data);
 }