thermal: qpnp-adc-tm: Reduce kernel log flood

Modify the pr_err log that is used for checking if
clients have a valid callback when threshold request
is made to pr_debug. Currently kernel logs are getting
flooded due to periodic request made from the client.

Change-Id: I74bf4115bc25396da16a96ad7378ba3a7375710f
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
diff --git a/drivers/thermal/qpnp-adc-tm.c b/drivers/thermal/qpnp-adc-tm.c
index f3b29c9..3b0ef8c 100644
--- a/drivers/thermal/qpnp-adc-tm.c
+++ b/drivers/thermal/qpnp-adc-tm.c
@@ -1315,7 +1315,7 @@
 		return -ENODEV;
 
 	if (param->threshold_notification == NULL) {
-		pr_err("No notification for high/low temp??\n");
+		pr_debug("No notification for high/low temp??\n");
 		return -EINVAL;
 	}