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Fix `listxattr()` response when xattr name list is empty

German Maglione requested to merge ghm-virtio-fs/virtiofsd:fix-listxattr-response into main

FUSE_LISTXATTR returns a xattr name list. It is possible that the name list is empty, because either there are no xattrs or all xattrs have been filtered out by the server.

As of now rust version of code writes a null byte to client supplied buffer. This fails the kernel fuse code verification and return -EIO to user space.

We need to send a response back with error code 0 and virtiofs kernel code will handle it and update the variable argument size to 0.

Closes #55 (closed)

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