Fix clang-tidy 14 issues

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Idb76ae375eff9a143497942013d94ca3b3252495
diff --git a/src/ExternalSensor.cpp b/src/ExternalSensor.cpp
index 5fba9b4..cc341f8 100644
--- a/src/ExternalSensor.cpp
+++ b/src/ExternalSensor.cpp
@@ -33,7 +33,7 @@
     writeTimeout(
         std::chrono::duration_cast<std::chrono::steady_clock::duration>(
             std::chrono::duration<double>(timeoutSecs))),
-    writeAlive(false), writePerishable(timeoutSecs > 0.0)
+    writePerishable(timeoutSecs > 0.0)
 {
     // The caller must specify what physical characteristic
     // an external sensor is expected to be measuring, such as temperature,