lis3mdl: Fix check_calibration() output
lis3mdl: Fix check_calibration() output

The previous implementation returned OK when the sensor was not calibrated and vice
versa. This fixes a preflight fail due to selftest failed.

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