Fix EmonSensor bug

code/espurna/sensors/EmonSensor.h

@@ -57,7 +57,7 @@ class EmonSensor : public I2CSensor {
 
         void resetEnergy(unsigned char channel, double value = 0) {
             if (channel >= _channels) return;
-            _energy[i] = value;
+            _energy[channel] = value;
         }
 
         // ---------------------------------------------------------------------