Wunused-variable: Fixed all unused variables in src

This commit addresses all warnings emitted from -Wunused-variable
in the C++ src.

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/ecs1030/ecs1030.cxx

@@ -53,7 +53,6 @@ ECS1030::~ECS1030 () {
 double
 ECS1030::getCurrency_A () {
     int     sensorValue  = 0;
-    float   rLoad        = 0;
     float   volt         = 0;
     float   rms          = 0;