Use unsigned types when finding the source offsets
Use unsigned types when finding the source offsets

aaronmjacobs/openal-soft,cambridgehackers/klaatu-openal-soft,EddieRingle/openal-soft,jims/openal-soft,franklixuefei/openal-soft,jims/openal-soft,Wemersive/openal-soft,mmozeiko/OpenAL-Soft,alexxvk/openal-soft,Wemersive/openal-soft,arkana-fts/openal-soft,soundsrc/openal-soft,rryan/openal-soft,dapetcu21/openal-soft,rryan/openal-soft,BeamNG/openal-soft,cambridgehackers/klaatu-openal-soft,arkana-fts/openal-soft,irungentoo/openal-soft-tox,BeamNG/openal-soft,cambridgehackers/klaatu-openal-soft,soundsrc/openal-soft,aaronmjacobs/openal-soft,EddieRingle/openal-soft,alexxvk/openal-soft,AerialX/openal-soft-android,mmozeiko/OpenAL-Soft,irungentoo/openal-soft-tox,franklixuefei/openal-soft