Fix potential out of bounds access in 151-OpenFileLimit test.

Bug: 71453022
Test: art/test/testrunner/testrunner.py -b -t 151-OpenFileLimit --host
Change-Id: Idb7ff3c219dc699d394e28918009d34886d3de25
diff --git a/test/151-OpenFileLimit/src/Main.java b/test/151-OpenFileLimit/src/Main.java
index 9fe47c8..de5890c 100644
--- a/test/151-OpenFileLimit/src/Main.java
+++ b/test/151-OpenFileLimit/src/Main.java
@@ -55,8 +55,11 @@
             System.out.println(e.getMessage());
         }
 
-        for (int i = 0; i < files.size(); i++) {
+        for (int i = 0; i < streams.size(); i++) {
           streams.get(i).close();
+        }
+
+        for (int i = 0; i < files.size(); i++) {
           files.get(i).delete();
         }
         System.out.println("done.");