iwlwifi3945/4965: fix rate control algo reference leak

Fix rate control algo reference leak in case if network device has been
failed to register. In this case special flag priv->mac80211_registered is
not set and the rate algo reference is not freeing on module unload. That
leads to OOPs in further ieee80211 rate register/unregister procedure (by
any callee).

It should fix the bug #9470

http://bugzilla.kernel.org/show_bug.cgi?id=9470

[[e-mail]: build fix]
Signed-off-by: Cyrill Gorcunov <[e-mail]>
Acked-by: Zhu Yi <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/iwlwifi/iwl3945-base.c

···
 		mutex_lock(&priv->mutex);
 
 		if (rc) {
+			iwl_rate_control_unregister(priv->hw);
 			IWL_ERROR("Failed to register network "
 				  "device (error %d)\n", rc);
 			return;

drivers/net/wireless/iwlwifi/iwl4965-base.c

···
 		mutex_lock(&priv->mutex);
 
 		if (rc) {
+			iwl_rate_control_unregister(priv->hw);
 			IWL_ERROR("Failed to register network "
 				  "device (error %d)\n", rc);
 			return;