iwl3945: kill hw_params.tx_ant_num

This patch removes tx_ant_num for hw_params structure. It is not used.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-dev.h

@@ -595,9 +595,6 @@ struct iwl_hw_params {
 	u32 ct_kill_threshold; /* value in hw-dependent units */
 	u32 calib_init_cfg;
 	const struct iwl_sensitivity_ranges *sens;
-
-	/* for 3945 */
-	u16 tx_ant_num;
 };