Clang-tidy-14 fixes

Do as the robot commands.  All changes made automatically by tidy.

Tested: (Thanks Zhikui)
Downloaded and run on system.  Sensors scan normally.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I752f37c9e7a95aa3be8e6980ba6e4b2b48b3395a
diff --git a/src/ExternalSensorMain.cpp b/src/ExternalSensorMain.cpp
index a096175..cbe2388 100644
--- a/src/ExternalSensorMain.cpp
+++ b/src/ExternalSensorMain.cpp
@@ -371,7 +371,7 @@
             return;
         }
 
-        auto messagePath = message.get_path();
+        const auto* messagePath = message.get_path();
         sensorsChanged->insert(messagePath);
         if constexpr (debug)
         {