pwm_out_sim: fix orb handle == 0 is valid & use orb_unsubscribe instead of px4_close
pwm_out_sim: fix orb handle == 0 is valid & use orb_unsubscribe instead of px4_close

krbeverx/Firmware,dagar/Firmware,dagar/Firmware,jlecoeur/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,darknight-007/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,darknight-007/Firmware,mcgill-robotics/Firmware,dagar/Firmware,Aerotenna/Firmware,krbeverx/Firmware,Aerotenna/Firmware,PX4/Firmware,mcgill-robotics/Firmware,PX4/Firmware,krbeverx/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,dagar/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,darknight-007/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,PX4/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,darknight-007/Firmware,acfloria/Firmware,acfloria/Firmware,PX4/Firmware,darknight-007/Firmware,acfloria/Firmware,acfloria/Firmware,jlecoeur/Firmware,krbeverx/Firmware,PX4/Firmware,dagar/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,acfloria/Firmware,acfloria/Firmware,PX4/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,dagar/Firmware,dagar/Firmware