iwlwifi: iwlmvm: fix typo when checking for TX Beamforming

Check the actual bit (mask) in Rx notification rate_n_flags.
Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

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

@@ -1150,7 +1150,7 @@ static void iwl_mvm_rx_he(struct iwl_mvm *mvm, struct sk_buff *skb,
 
 	he->data1 |= cpu_to_le16(he_type >> RATE_MCS_HE_TYPE_POS);
 
-	if (rate_n_flags & RATE_MCS_BF_POS)
+	if (rate_n_flags & RATE_MCS_BF_MSK)
 		he->data5 |= cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA5_TXBF);
 
 	switch ((rate_n_flags & RATE_MCS_HE_GI_LTF_MSK) >>