Suppress a possibly-uninitialized-variable warning. (I'm only seeing it

on Apple's gcc and not my other machines, but still it seems worth
getting rid of.)

src/pl/plpgsql/src/pl_exec.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.215 2008/05/15 22:39:49 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.216 2008/05/16 18:34:51 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -4047,7 +4047,7 @@ exec_eval_expr(PLpgSQL_execstate *estate,
 			   bool *isNull,
 			   Oid *rettype)
 {
-	Datum		result;
+	Datum		result = 0;
 	int			rc;
 
 	/*