ath9k: consider return code on

just to comply with current ath9k_hw_nvram_read to return value, hence
behaving reacting accordingly.
Signed-off-by: Eduardo Abinader <eduardo.abinader@riverbed.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath9k/ar9003_eeprom.c

@@ -3252,7 +3252,8 @@ static int ar9300_eeprom_restore_flash(struct ath_hw *ah, u8 *mptr,
 	int i;
 
 	for (i = 0; i < mdata_size / 2; i++, data++)
-		ath9k_hw_nvram_read(ah, i, data);
+		if (!ath9k_hw_nvram_read(ah, i, data))
+			return -EIO;
 
 	return 0;
 }
@@ -3282,7 +3283,8 @@ static int ar9300_eeprom_restore_internal(struct ath_hw *ah,
 	if (ath9k_hw_use_flash(ah)) {
 		u8 txrx;
 
-		ar9300_eeprom_restore_flash(ah, mptr, mdata_size);
+		if (ar9300_eeprom_restore_flash(ah, mptr, mdata_size))
+			return -EIO;
 
 		/* check if eeprom contains valid data */
 		eep = (struct ar9300_eeprom *) mptr;