octeon_ep: add missing destroy_workqueue in octep_init_module

octep_init_module misses destroy_workqueue in error path,
this patch fixes that.

Fixes: 862cd659a6fb ("octeon_ep: Add driver framework and device initialization")
Signed-off-by: Zheng Bin <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/marvell/octeon_ep/octep_main.c

···
 	if (ret < 0) {
 		pr_err("%s: Failed to register PCI driver; err=%d\n",
 		       OCTEP_DRV_NAME, ret);
+		destroy_workqueue(octep_wq);
 		return ret;
 	}