[PATCH] fix usb skeleton driver

[stefani]

From: Stefani Seibold <stefani@xxxxxxxxxxx>

This is a fix for the USB skeleton driver to bring it in shape.

- Code cleanup
- Eliminated dead code
- Handle a non blocking read without blocking
- Fix a small race condition
- Introduced fsync
- Single user mode

The patch is against linux 3.5.0 commit eea5b5510fc5545d15b69da8e485a7424ae388cf

Hope this helps

Signed-off-by: Stefani Seibold <stefani@xxxxxxxxxxx>
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