Fixed warning with GCC
Fixed warning with GCC

lono-devices/ArduinoJson,firepick1/ArduinoJson,spotman/ArduinoJson,chuz/ArduinoJson,venusdharan/ArduinoJson,ELZo3/ArduinoJson,venusdharan/ArduinoJson,janelia-arduino/ArduinoJson,peterpolidoro/ArduinoJson,peterpolidoro/ArduinoJson,alyf80/ArduinoJson,ELZo3/ArduinoJson,fayvlad/ArduinoJson,firepick1/ArduinoJson,hemantsangwan/Arduino-Json,ELZo3/ArduinoJson,peterpolidoro/ArduinoJson,chuz/ArduinoJson,janelia-arduino/ArduinoJson,naveensuryakumar/json,hassanabidpk/ArduinoJson,tirumalavan/ArduinoJson,naveensuryakumar/json,spotman/ArduinoJson,naveensuryakumar/json,hassanabidpk/ArduinoJson,AndreyAyres/ArduinoJson,0ddie/ArduinoJson,lono-devices/ArduinoJson,tirumalavan/ArduinoJson,alyf80/ArduinoJson,venkatarajasekhar/ArduinoJson,janelia-arduino/ArduinoJson,AndreyAyres/ArduinoJson,lono-devices/ArduinoJson,firepick1/ArduinoJson,chuz/ArduinoJson,PeeJay/ArduinoJson,PeeJay/ArduinoJson,hemantsangwan/Arduino-Json,venkatarajasekhar/ArduinoJson,CanTireInnovations/ArduinoJson,hassanabidpk/ArduinoJson,hemantsangwan/Arduino-Json,AndreyAyres/ArduinoJson,peterpolidoro/ArduinoJson,bblanchon/ArduinoJson,bblanchon/ArduinoJson,janelia-arduino/ArduinoJson,weera00/ArduinoJson,weera00/ArduinoJson,fayvlad/ArduinoJson,venkatarajasekhar/ArduinoJson,spotman/ArduinoJson,CanTireInnovations/ArduinoJson,bblanchon/ArduinoJson,CanTireInnovations/ArduinoJson,tirumalavan/ArduinoJson,PeeJay/ArduinoJson,0ddie/ArduinoJson,alyf80/ArduinoJson,fayvlad/ArduinoJson,weera00/ArduinoJson,venusdharan/ArduinoJson