lxc: Only check @nparams in lxcDomainBlockStatsFlags
lxc: Only check @nparams in lxcDomainBlockStatsFlags

Remove the "!params" check from the condition since it's possible
someone could pass a non NULL value there, but a 0 for the nparams
and thus continue on.  The external API only checks if @nparams is
non-zero, then check for NULL @params.

Found by Coverity

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>
ACKed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

jfehlig/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,olafhering/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jfehlig/libvirt,eskultety/libvirt,eskultety/libvirt,crobinso/libvirt,crobinso/libvirt,andreabolognani/libvirt,zippy2/libvirt,crobinso/libvirt,andreabolognani/libvirt,zippy2/libvirt,libvirt/libvirt,olafhering/libvirt,libvirt/libvirt,zippy2/libvirt,olafhering/libvirt,andreabolognani/libvirt,crobinso/libvirt,jardasgit/libvirt,olafhering/libvirt,jardasgit/libvirt,libvirt/libvirt,nertpinx/libvirt,zippy2/libvirt,jardasgit/libvirt,nertpinx/libvirt,eskultety/libvirt,nertpinx/libvirt,eskultety/libvirt,jardasgit/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,jfehlig/libvirt,libvirt/libvirt,eskultety/libvirt,jardasgit/libvirt