thermal: qcom-spmi-temp-alarm: Don't suppress negative temp

Currently driver is suppressing the negative temperature
readings from the vadc. Consumers of the thermal zones need
to read the negative temperature too. Don't suppress the
readings.

Fixes: c610afaa ("thermal: Add QPNP PMIC temperature alarm driver")
Signed-off-by: NVeera Vegivada <vvegivad@codeaurora.org>
Signed-off-by: NGuru Das Srinagesh <gurus@codeaurora.org>
Reviewed-by: NStephen Boyd <sboyd@kernel.org>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/944856eb819081268fab783236a916257de120e4.1596040416.git.gurus@codeaurora.org

drivers/thermal/qcom/qcom-spmi-temp-alarm.c

 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2011-2015, 2017, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2011-2015, 2017, 2020, The Linux Foundation. All rights reserved.
  */
 
 #include <linux/bitops.h>
@@ -191,7 +191,7 @@ static int qpnp_tm_get_temp(void *data, int *temp)
 		chip->temp = mili_celsius;
 	}
 
-	*temp = chip->temp < 0 ? 0 : chip->temp;
+	*temp = chip->temp;
 
 	return 0;
 }