qemu_hotplug: Remove iommufd object if no longer needed

When removing last host device using IOMMUFD remove the iommufd object
as well.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_hotplug.c

@@ -4997,6 +4997,14 @@ qemuDomainRemoveHostDevice(virQEMUDriver *driver,
         }
     }
 
+    if (priv->iommufdState &&
+        !virDomainDefHasPCIHostdevWithIOMMUFD(vm->def)) {
+        qemuDomainObjEnterMonitor(vm);
+        ignore_value(qemuMonitorDelObject(priv->mon, "iommufd0", false));
+        qemuDomainObjExitMonitor(vm);
+        priv->iommufdState = false;
+    }
+
     virDomainAuditHostdev(vm, hostdev, "detach", true);
 
     if (!virHostdevIsPCIDevice(hostdev) &&