Otherwise we erroneously fall through the LIBXL_DOMAIN_TYPE_PV case into the
"default: abort()".
(I'm sure we fixed this once already...)
Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Tested-by: Dario Faggioli <dario.faggioli@citrix.com> Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>