fsogsmd: modem_nokia_isi: always throw an error, if ISI callbacks fail
fsogsmd: modem_nokia_isi: always throw an error, if ISI callbacks fail

slyon/debian-libfsoframework,slyon/debian-fso-deviced,slyon/debian-libfsoframework,slyon/debian-fso-usaged,slyon/debian-fso-deviced,slyon/debian-fso-usaged