Async dblink functions require a named connection, and therefore should

use DBLINK_GET_NAMED_CONN rather than DBLINK_GET_CONN.
Problem found by Peter Eisentraut and patch by Fujii Masao.

contrib/dblink/dblink.c

@@ -613,16 +613,13 @@ Datum
 dblink_send_query(PG_FUNCTION_ARGS)
 {
 	PGconn	   *conn = NULL;
-	char	   *connstr = NULL;
 	char	   *sql = NULL;
 	remoteConn *rconn = NULL;
-	char	   *msg;
-	bool		freeconn = false;
 	int			retval;
 
 	if (PG_NARGS() == 2)
 	{
-		DBLINK_GET_CONN;
+		DBLINK_GET_NAMED_CONN;
 		sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
 	}
 	else
@@ -711,13 +708,13 @@ dblink_record_internal(FunctionCallInfo fcinfo, bool is_async)
 		if (PG_NARGS() == 2)
 		{
 			/* text,bool */
-			DBLINK_GET_CONN;
+			DBLINK_GET_NAMED_CONN;
 			fail = PG_GETARG_BOOL(1);
 		}
 		else if (PG_NARGS() == 1)
 		{
 			/* text */
-			DBLINK_GET_CONN;
+			DBLINK_GET_NAMED_CONN;
 		}
 		else
 			/* shouldn't happen */