Remove unreferenced and empty HIDPowerDevice_::end

Proposal to simplify the implementation by removing dead code.

Author: forderud

src/HIDPowerDevice.cpp

@@ -247,9 +247,6 @@ void HIDPowerDevice_::setSerial(const char* s) {
     HID().setSerial(s);
 }
 
-void HIDPowerDevice_::end(void) {
-}
-
 int HIDPowerDevice_::sendDate(uint16_t id, uint16_t year, uint8_t month, uint8_t day) {
     uint16_t bval = (year - 1980)*512 + month * 32 + day;
     return HID().SendReport(id, &bval, sizeof (bval));

src/HIDPowerDevice.h

@@ -108,9 +108,6 @@ class HIDPowerDevice_  {
 
   void setSerial(const char*);
 
-  
-  void end(void);
-  
   int sendDate(uint16_t id, uint16_t year, uint8_t month, uint8_t day);
   int sendReport(uint16_t id, const void* bval, int len);