qemuDomainDetachWatchdog: Don't release watchdog address twice

On watchdog unplug, when qemu doesn't support DEVICE_DELETED event
(or couple of other reasons) we do two things:

1) release watchdog device address,
2) call qemuDomainRemoveWatchdog() which does 1) again.

This is potentially dangerous.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_hotplug.c

@@ -5344,10 +5344,8 @@ qemuDomainDetachWatchdog(virQEMUDriverPtr driver,
         ret = -1;
 
     if (ret == 0) {
-        if ((ret = qemuDomainWaitForDeviceRemoval(vm)) == 1) {
-            qemuDomainReleaseDeviceAddress(vm, &watchdog->info, NULL);
+        if ((ret = qemuDomainWaitForDeviceRemoval(vm)) == 1)
             ret = qemuDomainRemoveWatchdog(driver, vm, watchdog);
-        }
     }
     qemuDomainResetDeviceRemoval(vm);