Don't fail entire directory if it contains a single unreadable file

[RalfJung]

In /storage/sdcard1, there is a folder .android_secure which I cannot access via adb. There's also a bunch of perfectly fine directories in there, like Android and Music. However, executing adb shell busybox ls -1a --color\=none "/storage/sdcard1" contains the "Permission denied" error message, and that seems to cause adbfs to just return an I/O error when I do ls storage/sdcard1. Instead, it should be fine with not being able to access some of the directories in there.

[rodneyrod]

Has there been a fix to this yet?