ath: Fix uninitialized variable warnings

Fixes 'make -j24 CONFIG_DEBUG_SECTION_MISMATCH=y' warning:

drivers/net/wireless/ath/ath9k/eeprom_4k.c: In function ‘ath9k_hw_get_4k_gain_boundaries_pdadcs.clone.1’:
drivers/net/wireless/ath/ath9k/eeprom_4k.c:311: error: ‘minPwrT4’ may be used uninitialized in this function
drivers/net/wireless/ath/ath9k/eeprom_9287.c: In function ‘ath9k_hw_get_AR9287_gain_boundaries_pdadcs’:
drivers/net/wireless/ath/ath9k/eeprom_9287.c:302: error: ‘minPwrT4’ may be used uninitialized in this function
drivers/net/wireless/ath/ath9k/eeprom_def.c: In function ‘ath9k_hw_get_def_gain_boundaries_pdadcs.clone.0’:
drivers/net/wireless/ath/ath9k/eeprom_def.c:679: error: ‘minPwrT4’ may be used uninitialized in this function

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/eeprom_4k.c

@@ -249,6 +249,7 @@ static void ath9k_hw_get_4k_gain_boundaries_pdadcs(struct ath_hw *ah,
 	struct chan_centers centers;
 #define PD_GAIN_BOUNDARY_DEFAULT 58;
 
+	memset(&minPwrT4, 0, AR9287_NUM_PD_GAINS);
 	ath9k_hw_get_channel_centers(ah, chan, &centers);
 
 	for (numPiers = 0; numPiers < availPiers; numPiers++) {

drivers/net/wireless/ath/ath9k/eeprom_9287.c

@@ -250,6 +250,7 @@ static void ath9k_hw_get_ar9287_gain_boundaries_pdadcs(struct ath_hw *ah,
 	static u8 vpdTableI[AR5416_EEP4K_NUM_PD_GAINS]
 		[AR5416_MAX_PWR_RANGE_IN_HALF_DB];
 
+	memset(&minPwrT4, 0, AR9287_NUM_PD_GAINS);
 	ath9k_hw_get_channel_centers(ah, chan, &centers);
 
 	for (numPiers = 0; numPiers < availPiers; numPiers++) {

drivers/net/wireless/ath/ath9k/eeprom_def.c

@@ -617,6 +617,7 @@ static void ath9k_hw_get_def_gain_boundaries_pdadcs(struct ath_hw *ah,
 	int16_t minDelta = 0;
 	struct chan_centers centers;
 
+	memset(&minPwrT4, 0, AR9287_NUM_PD_GAINS);
 	ath9k_hw_get_channel_centers(ah, chan, &centers);
 
 	for (numPiers = 0; numPiers < availPiers; numPiers++) {