Should return true if the specified file doesn't exist

This method is used by MediaPlayerStressTest#doTestVideoPlayback().
When it is forgotten to copy media files into the test device before
doing MediaStressTest, the test would be skipped then it would be
passed. If the method returns true, the test is conducted then it
would be failed.

Change-Id: Iaf2cc541f5dd1b87ee7b2eb210b24af506297885
diff --git a/libs/deviceutil/src/android/cts/util/MediaUtils.java b/libs/deviceutil/src/android/cts/util/MediaUtils.java
index faf31cf..74c4166 100755
--- a/libs/deviceutil/src/android/cts/util/MediaUtils.java
+++ b/libs/deviceutil/src/android/cts/util/MediaUtils.java
@@ -281,7 +281,7 @@
                 ex.release();
             }
         }
-        return false;
+        return true;
     }
 
     public static boolean checkCodecsForPath(Context context, String path) {