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

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.