qemu: Skip starting NBD servers for offline migration

NBD storage migration will not work with offline migration anyway and we
already checked that the user did not ask for it. Thus it doesn't make
sense to keep the code after 'done' label where we jump in case of
offline migration.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_migration.c

@@ -3418,6 +3418,9 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
                              "make sense"));
             goto cleanup;
         }
+        cookieFlags = 0;
+    } else {
+        cookieFlags = QEMU_MIGRATION_COOKIE_GRAPHICS;
     }
 
     if (!(caps = virQEMUDriverGetCapabilities(driver, false)))
@@ -3572,32 +3575,26 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
                                QEMU_ASYNC_JOB_MIGRATION_IN) < 0)
         goto stopjob;
 
-    if (mig->lockState) {
-        VIR_DEBUG("Received lockstate %s", mig->lockState);
-        VIR_FREE(priv->lockState);
-        priv->lockState = mig->lockState;
-        mig->lockState = NULL;
-    } else {
-        VIR_DEBUG("Received no lockstate");
-    }
-
- done:
-    if (flags & VIR_MIGRATE_OFFLINE)
-        cookieFlags = 0;
-    else
-        cookieFlags = QEMU_MIGRATION_COOKIE_GRAPHICS;
-
     if (mig->nbd &&
         flags & (VIR_MIGRATE_NON_SHARED_DISK | VIR_MIGRATE_NON_SHARED_INC) &&
         virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_NBD_SERVER)) {
         if (qemuMigrationStartNBDServer(driver, vm, listenAddress,
                                         nmigrate_disks, migrate_disks) < 0) {
-            /* error already reported */
             goto stopjob;
         }
         cookieFlags |= QEMU_MIGRATION_COOKIE_NBD;
     }
 
+    if (mig->lockState) {
+        VIR_DEBUG("Received lockstate %s", mig->lockState);
+        VIR_FREE(priv->lockState);
+        priv->lockState = mig->lockState;
+        mig->lockState = NULL;
+    } else {
+        VIR_DEBUG("Received no lockstate");
+    }
+
+ done:
     if (qemuMigrationBakeCookie(mig, driver, vm, cookieout,
                                 cookieoutlen, cookieFlags) < 0) {
         /* We could tear down the whole guest here, but