wifi: iwlwifi: mvm: tx: remove misleading if statement

The if statement here is misleading, we return zero anyway
since we just checked the 'ret' variable, simplify the code
to remove the condition entirely.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230414130637.57c1eb58e655.I1b47a7771cd66306931089c150c6b5b240bdcba5@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

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

@@ -1255,8 +1255,7 @@ int iwl_mvm_tx_skb_sta(struct iwl_mvm *mvm, struct sk_buff *skb,
 	if (ret)
 		return ret;
 
-	if (WARN_ON(skb_queue_empty(&mpdus_skbs)))
-		return ret;
+	WARN_ON(skb_queue_empty(&mpdus_skbs));
 
 	while (!skb_queue_empty(&mpdus_skbs)) {
 		skb = __skb_dequeue(&mpdus_skbs);