WindCharger: Removed unused var in temp sensor driver.

Change-Id: I1e7c810a6bc381ea1caae37bdb81984317ea1281
diff --git a/drivers/hwmon/ath_mn_lm95071.c b/drivers/hwmon/ath_mn_lm95071.c
index 8a7d102..4d60590 100644
--- a/drivers/hwmon/ath_mn_lm95071.c
+++ b/drivers/hwmon/ath_mn_lm95071.c
@@ -68,7 +68,6 @@
 {
   s16 temp;
   u16 raw_temp, sign;
-  int is_negative = 1;
   lm_dev.lock();
   lm_spi_delay_16();
   raw_temp = lm_spi_rd_16();