Prevent #option dump from crashing on FORI statement with null step. Reported by Pavel.

src/pl/plpgsql/src/pl_funcs.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_funcs.c,v 1.88 2010/01/19 01:35:31 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_funcs.c,v 1.89 2010/02/17 01:48:45 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -543,10 +543,13 @@ dump_fori(PLpgSQL_stmt_fori *stmt)
 	printf("    upper = ");
 	dump_expr(stmt->upper);
 	printf("\n");
+	if (stmt->step)
+	{
 		dump_ind();
 		printf("    step = ");
 		dump_expr(stmt->step);
 		printf("\n");
+	}
 	dump_indent -= 2;
 
 	dump_stmts(stmt->body);