srf02: fix resource leak (unclosed fd)
srf02: fix resource leak (unclosed fd)

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