[libvirt] [PATCH v4 0/2] Add <seclabel> to character devices.

[Richard W.M. Jones]

The updates compared to the previous version:

- All style issues fixed, except for a few long lines where it's just
  not possible to split the lines and keep the code looking
  reasonable.

- Added RNG.

- Fixed the potential segfault on the error path in
  virSecurityDeviceLabelDefParseXML

- Simplified the changes to virSecurityDeviceLabelDefParseXML by using
  local variables to store the returned values until just before we
  return, when we assign them to the final '_rtn' parameters.

Rich.