Merge "Do not scan a file which cannot be read"

am: 258baa3

* commit '258baa35c080cc74e83c9324c900f6725288b7cf':
  Do not scan a file which cannot be read

media/java/android/media/MediaScanner.java

@@ -1390,7 +1390,7 @@ public class MediaScanner
             prescan(path, true);
 
             File file = new File(path);
-            if (!file.exists()) {
+            if (!file.exists() || !file.canRead()) {
                 return null;
             }