Downgrade locApiStopTracking print error to debug

On cleanup, the locApiStopTracking is called regardless
if a session is active or not, where this error would
be printed. This is an expected case, so it should not
be an error print.

Change-Id: Ieb10d159ad61a212821ef897d50d635354557cca
CRs-fixed: 2461760
diff --git a/location/LocationAPIClientBase.cpp b/location/LocationAPIClientBase.cpp
index 67e559b..5a09712 100644
--- a/location/LocationAPIClientBase.cpp
+++ b/location/LocationAPIClientBase.cpp
@@ -366,7 +366,7 @@
             mLocationAPI->stopTracking(session);
             mTracking = false;
         } else {
-            LOC_LOGE("%s:%d] invalid session: %d.", __FUNCTION__, __LINE__, session);
+            LOC_LOGD("%s:%d] invalid session: %d.", __FUNCTION__, __LINE__, session);
         }
     }
     pthread_mutex_unlock(&mMutex);