Fix bug per Oleksiy Shchukin - 2nd argument for dblink_get_result(text,bool)

is PG_GETARG_BOOL(2), should be PG_GETARG_BOOL(1).

Apply simple fix to back branches only. More extensive change to be applied
to head per Tom's suggestion.

contrib/dblink/dblink.c

@@ -8,7 +8,7 @@
  * Darko Prenosil <Darko.Prenosil@finteh.hr>
  * Shridhar Daithankar <shridhar_daithankar@persistent.co.in>
  *
- * $PostgreSQL: pgsql/contrib/dblink/dblink.c,v 1.60.2.3 2008/11/30 23:24:08 tgl Exp $
+ * $PostgreSQL: pgsql/contrib/dblink/dblink.c,v 1.60.2.4 2009/01/03 19:58:10 joe Exp $
  * Copyright (c) 2001-2006, PostgreSQL Global Development Group
  * ALL RIGHTS RESERVED;
  *
@@ -806,7 +806,7 @@ dblink_record_internal(FunctionCallInfo fcinfo, bool is_async, bool do_get)
 			{
 				/* text,bool */
 				DBLINK_GET_CONN;
-				fail = PG_GETARG_BOOL(2);
+				fail = PG_GETARG_BOOL(1);
 			}
 			else if (PG_NARGS() == 1)
 			{