message: memleak: i2c init was getting called twice
  Removed duplicate call to mraa_i2c_init which was allocating
  space for the i2c device twice.
diff: @@ -36,7 +36,7 @@ ADC121C021::ADC121C021(int bus, uint8_t address, float vref)
  {
  // setup our i2c link
  m_i2c = mraa_i2c_init(bus);
  - if ( !(m_i2c = mraa_i2c_init(bus)) )
  + if (!m_i2c)
  {
  throw std::invalid_argument(std::string(__FUNCTION__) +
  ": mraa_i2c_init() failed");
  