qemu: hotplug: Do not try to add secret object for TLS if it does not exist

The check whether the object holding secret for decryption of the TLS
environment was wrong and would always attempt to add the object. This
lead to a crash due to recent refactors.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1598015Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_hotplug.c

@@ -1341,7 +1341,7 @@ qemuDomainAddTLSObjects(virQEMUDriverPtr driver,
     if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
         return -1;
 
-    if (secProps &&
+    if (secProps && *secProps &&
         qemuMonitorAddObject(priv->mon, secProps, &secAlias) < 0)
         goto error;