Fix compilation error of ALSA sound with clang
Fix compilation error of ALSA sound with clang

/media/psf/Home/Smalltalk/OpenSmalltalk/opensmalltalk-vm/platforms/unix/vm-sound-ALSA/sqUnixSoundALSA.c:673:3: error: non-void function 'mixer_default_volume_get_set' should return a value [-Wreturn-type]
                return;
                ^

OpenSmalltalk/vm,OpenSmalltalk/vm,OpenSmalltalk/vm,timfel/squeakvm,timfel/squeakvm,timfel/squeakvm,timfel/squeakvm,timfel/squeakvm,OpenSmalltalk/vm,timfel/squeakvm,timfel/squeakvm,OpenSmalltalk/vm,timfel/squeakvm,OpenSmalltalk/vm,OpenSmalltalk/vm,OpenSmalltalk/vm