qemu: Fix comparison assignment in qemuDomainUpdateDeviceLive
qemu: Fix comparison assignment in qemuDomainUpdateDeviceLive

Fix this common typo and assign a value rather than implicitly
type-casted comparison result. Introduced by commit b6a264e855.

Signed-off-by: Erik Skultety <2c14d38fa47c8799f1b9c16280abe27f8edfec6e@redhat.com>

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