ist8310: remove undef
ist8310: remove undef

Use PX4_ERROR instead.

PX4/Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,PX4/Firmware,PX4/Firmware,dagar/Firmware,jlecoeur/Firmware,dagar/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,PX4/Firmware,jlecoeur/Firmware,dagar/Firmware,jlecoeur/Firmware,PX4/Firmware,dagar/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,Aerotenna/Firmware,acfloria/Firmware,Aerotenna/Firmware,dagar/Firmware,Aerotenna/Firmware,dagar/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,krbeverx/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,krbeverx/Firmware,jlecoeur/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,PX4/Firmware