[ath5k] Avoid unused variable warning in gcc 4.6

Reported-by: Ralph Giles <giles@thaumas.net>
Tested-by: Ralph Giles <giles@thaumas.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/ath5k/ath5k_phy.c

 static u32 ath5k_hw_rf_gainf_corr(struct ath5k_hw *ah)
 {
 	u32 mix, step;
-	u32 *rf;
 	const struct ath5k_gain_opt *go;
 	const struct ath5k_gain_opt_step *g_step;
 	const struct ath5k_rf_reg *rf_regs;
 	if (ah->ah_rf_banks == NULL)
 		return 0;
 
-	rf = ah->ah_rf_banks;
 	ah->ah_gain.g_f_corr = 0;
 
 	/* No VGA (Variable Gain Amplifier) override, skip */
 {
 	const struct ath5k_rf_reg *rf_regs;
 	u32 step, mix_ovr, level[4];
-	u32 *rf;
 
 	if (ah->ah_rf_banks == NULL)
 		return 0;
 
-	rf = ah->ah_rf_banks;
-
 	if (ah->ah_radio == AR5K_RF5111) {
 
 		rf_regs = rf_regs_5111;

src/drivers/net/ath5k/ath5k_qcu.c

 int ath5k_hw_setup_tx_queue(struct ath5k_hw *ah, enum ath5k_tx_queue queue_type,
 		struct ath5k_txq_info *queue_info)
 {
-	unsigned int queue;
 	int ret;
 
-	/* We only use one queue */
-	queue = 0;
-
 	/*
 	 * Setup internal queue structure
 	 */

src/drivers/net/ath5k/ath5k_reset.c

 int ath5k_hw_reset(struct ath5k_hw *ah,
 	struct net80211_channel *channel, int change_channel)
 {
-	u32 s_seq[10], s_ant, s_led[3], staid1_flags, tsf_up, tsf_lo;
+	u32 s_seq[10], s_ant, s_led[3], staid1_flags;
 	u32 phy_tst1;
 	u8 mode, freq, ee_mode, ant[2];
 	int i, ret;
 	s_ant = 0;
 	ee_mode = 0;
 	staid1_flags = 0;
-	tsf_up = 0;
-	tsf_lo = 0;
 	freq = 0;
 	mode = 0;