wifi: iwlwifi: fix iwl_mvm_get_valid_rx_ant()

Fix incorrect use of _tx_ valid ant data in the function.

Fixes: 4ea1ed1d ("wifi: iwlwifi: mvm: support set_antenna()")
Signed-off-by: Daniel Gabay <daniel.gabay@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20240618200104.b7c6a320c7dc.I3092eb5275056f2162b9694e583c310c38568b2a@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -1875,10 +1875,10 @@ static inline u8 iwl_mvm_get_valid_tx_ant(struct iwl_mvm *mvm)
 
 static inline u8 iwl_mvm_get_valid_rx_ant(struct iwl_mvm *mvm)
 {
-	u8 rx_ant = mvm->fw->valid_tx_ant;
+	u8 rx_ant = mvm->fw->valid_rx_ant;
 
 	if (mvm->nvm_data && mvm->nvm_data->valid_rx_ant)
-		rx_ant &= mvm->nvm_data->valid_tx_ant;
+		rx_ant &= mvm->nvm_data->valid_rx_ant;
 
 	if (mvm->set_rx_ant)
 		rx_ant &= mvm->set_rx_ant;