iwlwifi: mvm: change access to ieee80211_hdr

Make the code clearer.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index 0c073e0..4cce372 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -294,7 +294,7 @@
 	struct ieee80211_rx_status *rx_status;
 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
 	struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
-	struct ieee80211_hdr *hdr = (void *)(desc + 1);
+	struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
 	u32 len = le16_to_cpu(desc->mpdu_len);
 	u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
 	struct ieee80211_sta *sta = NULL;