cleanup: reduced scope of variables

Cppcheck CI tool identified many variables whose scope could be reduced.

Change-Id: I1478b5680adc560d08bc74ffc91929b1d19e24fa
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/sensor.cpp b/sensor.cpp
index e68f7a7..21f3d87 100644
--- a/sensor.cpp
+++ b/sensor.cpp
@@ -170,8 +170,6 @@
     namespace fs = std::experimental::filesystem;
 
     std::shared_ptr<StatusObject> iface = nullptr;
-    static constexpr bool deferSignals = true;
-    auto& bus = *std::get<sdbusplus::bus::bus*>(info);
     auto& objPath = std::get<std::string>(info);
     auto& obj = std::get<Object>(info);
 
@@ -185,11 +183,10 @@
     if (fs::exists(sysfsFullPath))
     {
         bool functional = true;
-        uint32_t fault = 0;
         try
         {
-            fault = ioAccess.read(faultName, faultID, entry, hwmonio::retries,
-                                  hwmonio::delay);
+            uint32_t fault = ioAccess.read(faultName, faultID, entry,
+                                           hwmonio::retries, hwmonio::delay);
             if (fault != 0)
             {
                 functional = false;
@@ -209,6 +206,9 @@
                 phosphor::logging::entry("FILE=%s", sysfsFullPath.c_str()));
         }
 
+        static constexpr bool deferSignals = true;
+        auto& bus = *std::get<sdbusplus::bus::bus*>(info);
+
         iface =
             std::make_shared<StatusObject>(bus, objPath.c_str(), deferSignals);
         // Set functional property