mac80211_hwsim: fix module init error paths

We didn't free the workqueue on any errors, nor did we
correctly check for rhashtable allocation errors, nor
did we free the hashtable on error.
Reported-by: Colin King <colin.king@canonical.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>

drivers/net/wireless/mac80211_hwsim.c

@@ -3572,11 +3572,14 @@ static int __init init_mac80211_hwsim(void)
 	hwsim_wq = alloc_workqueue("hwsim_wq", 0, 0);
 	if (!hwsim_wq)
 		return -ENOMEM;
-	rhashtable_init(&hwsim_radios_rht, &hwsim_rht_params);
+
+	err = rhashtable_init(&hwsim_radios_rht, &hwsim_rht_params);
+	if (err)
+		goto out_free_wq;
 
 	err = register_pernet_device(&hwsim_net_ops);
 	if (err)
-		return err;
+		goto out_free_rht;
 
 	err = platform_driver_register(&mac80211_hwsim_driver);
 	if (err)
@@ -3701,6 +3704,10 @@ static int __init init_mac80211_hwsim(void)
 	platform_driver_unregister(&mac80211_hwsim_driver);
 out_unregister_pernet:
 	unregister_pernet_device(&hwsim_net_ops);
+out_free_rht:
+	rhashtable_destroy(&hwsim_radios_rht);
+out_free_wq:
+	destroy_workqueue(hwsim_wq);
 	return err;
 }
 module_init(init_mac80211_hwsim);