Implement clang-tidy fixes

clang-tidy allows the CI robot to check many things via static analysis.

All changes here were made by the clang-tidy robot, and include a number
of modernization fixes.  updating the tidy file will be done at a later
date.

Signed-off-by: Ed Tanous <etanous@nvidia.com>
Change-Id: I98cc4d600a3c589675507958f6d2350b2141216b
diff --git a/sysfs/util.cpp b/sysfs/util.cpp
index 8266040..214d668 100644
--- a/sysfs/util.cpp
+++ b/sysfs/util.cpp
@@ -59,11 +59,9 @@
 
         return fldr + f;
     }
-    else
-    {
-        /* It'll throw an exception when we use it if it's still bad. */
-        return original;
-    }
+
+    /* It'll throw an exception when we use it if it's still bad. */
+    return original;
 }
 
 } // namespace pid_control