[PATCH] Fix bogus fsync() error

[Christian Franke]

If used on raw devices like /dev/sda fsync() always fails with EBADRQC 
(54) because FlushFileBuffers() always fails with ERROR_INVALID_FUNCTION 
(1).

The attached patch fixes this by simply ignoring this error in the 
fhandler_base implementation. This should not affect any real flush 
errors which likely would return other error codes.

An alternative approach would be to ignore the error only in a new 
fhandler_raw_dev/floppy::fsync(). IMO not worth the effort is this case.

Christian

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