net: stmmac: fix errno when create_singlethread_workqueue() fails

We should set the return value to -ENOMEM explicitly when
create_singlethread_workqueue() fails in stmmac_dvr_probe(),
otherwise we'll lose the error value.

Fixes: a137f3f ("net: stmmac: fix possible memory leak in stmmac_dvr_probe()")
Signed-off-by: Gaosheng Cui <[email protected]>
Reviewed-by: Leon Romanovsky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: gscui

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -7099,6 +7099,7 @@ int stmmac_dvr_probe(struct device *device,
 	priv->wq = create_singlethread_workqueue("stmmac_wq");
 	if (!priv->wq) {
 		dev_err(priv->device, "failed to create workqueue\n");
+		ret = -ENOMEM;
 		goto error_wq_init;
 	}