iwlagn: remove un-necessary "_agn"

After driver split, extra _agn in priv structure is no needed, remove it.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-calib.c b/drivers/net/wireless/iwlwifi/iwl-agn-calib.c
index 204f0ec..72d6297 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-calib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-calib.c
@@ -889,7 +889,7 @@
 		memset(&cmd, 0, sizeof(cmd));
 
 		iwl_set_calib_hdr(&cmd.hdr,
-			priv->_agn.phy_calib_chain_noise_gain_cmd);
+			priv->phy_calib_chain_noise_gain_cmd);
 		cmd.delta_gain_1 = data->delta_gain_code[1];
 		cmd.delta_gain_2 = data->delta_gain_code[2];
 		trans_send_cmd_pdu(&priv->trans, REPLY_PHY_CALIBRATION_CMD,