fix camera_trigger gpio: _pins[i] == 0 is valid
fix camera_trigger gpio: _pins[i] == 0 is valid

Because _pins[i] is set from parameter value - 1

krbeverx/Firmware,acfloria/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,PX4/Firmware,PX4/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,dagar/Firmware,dagar/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,dagar/Firmware,PX4/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,dagar/Firmware,PX4/Firmware,krbeverx/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,PX4/Firmware,acfloria/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,krbeverx/Firmware,krbeverx/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,PX4/Firmware,dagar/Firmware,dagar/Firmware,acfloria/Firmware,dagar/Firmware