printload: fix buffer overflow on NuttX
printload: fix buffer overflow on NuttX

The NuttX config variable CONFIG_TASK_NAME_SIZE does not include the
null terminator byte, thus the buffer needs to be longer by 1 byte.

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