qemuDomainUSBAddressAddHubs: use numeric comparison
qemuDomainUSBAddressAddHubs: use numeric comparison

Since data.count is not a pointer, but an integer,
compare it against an integer value instead of using
the implicit "boolean" conversion that is customarily
used for pointers.

Signed-off-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

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