qemu: Avoid removing persistent config if migration fails

When migration fails in qemuMigrationPrepareAny, we unconditionally call
qemuDomainRemoveInactive, which should only be called for transient
domains. The check for !vm->persistent was accidentally removed by
commit 540c339a.
Signed-off-by: NLuyao Huang <lhuang@redhat.com>
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_migration.c

@@ -3432,7 +3432,8 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
         VIR_FREE(priv->origname);
         virPortAllocatorRelease(driver->migrationPorts, priv->nbdPort);
         priv->nbdPort = 0;
-        qemuDomainRemoveInactive(driver, vm);
+        if (!vm->persistent)
+            qemuDomainRemoveInactive(driver, vm);
     }
     virDomainObjEndAPI(&vm);
     if (event)