udev: nodeStateInitializeEnumerate: remove watch handle in case of an error

If the udev thread is stopped, it must be ensured that the watch
handle is also removed from the main loop.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/node_device/node_device_udev.c

@@ -1802,6 +1802,8 @@ nodeStateInitializeEnumerate(void *opaque)
 
  error:
     virObjectLock(priv);
+    ignore_value(virEventRemoveHandle(priv->watch));
+    priv->watch = -1;
     priv->threadQuit = true;
     virObjectUnlock(priv);
 }