iwlwifi: mvm: use IEEE80211_TX_CTRL_PORT_CTRL_PROTO flag

Instead of checking the SKB protocol against EAP, check the
IEEE80211_TX_CTRL_PORT_CTRL_PROTO flag that more generally
indicates whether or not the frame is a port control frame.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/tx.c b/drivers/net/wireless/iwlwifi/mvm/tx.c
index 8d18bf2..852d9d8 100644
--- a/drivers/net/wireless/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/iwlwifi/mvm/tx.c
@@ -122,7 +122,7 @@
 		 * it
 		 */
 		WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
-	} else if (skb->protocol == cpu_to_be16(ETH_P_PAE)) {
+	} else if (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) {
 		tx_cmd->pm_frame_timeout = cpu_to_le16(2);
 	} else {
 		tx_cmd->pm_frame_timeout = 0;