qemu: blockjob: Mark job as started only when it's new

Switching a block job to some states (e.g. QEMU_BLOCKJOB_STATE_READY)
might not require a job, thus if it will become ready asynchronously we
should not overwrite the state any more.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_blockjob.c

@@ -149,7 +149,8 @@ qemuBlockJobDiskGetJob(virDomainDiskDefPtr disk)
 void
 qemuBlockJobStarted(qemuBlockJobDataPtr job)
 {
-    job->state = QEMU_BLOCKJOB_STATE_RUNNING;
+    if (job->state == QEMU_BLOCKJOB_STATE_NEW)
+        job->state = QEMU_BLOCKJOB_STATE_RUNNING;
 }