iwlwifi: mvm: remove outdated comment referring to wake lock

There's no multicast wake lock in the driver, remove the comment
that refers to it.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/power.c

@@ -370,8 +370,6 @@ static void iwl_mvm_power_config_skip_dtim(struct iwl_mvm *mvm,
 	if (dtimper >= 10)
 		return;
 
-	/* TODO: check that multicast wake lock is off */
-
 	if (host_awake) {
 		if (iwlmvm_mod_params.power_scheme != IWL_POWER_SCHEME_LP)
 			return;