ALSA: remove duplicate assert
ALSA: remove duplicate assert

Thanks to Devin Anderson for pointing it out.

weizhiwu/libsoundio,shaunstanislaus/libsoundio,island-org/libsoundio,shaunstanislaus/libsoundio,bestwpw/libsoundio,island-org/libsoundio,vanloswang/libsoundio,tmatth/libsoundio,tresf/libsoundio,davidgranstrom/libsoundio,tresf/libsoundio,bestwpw/libsoundio,gityf/libsoundio,weizhiwu/libsoundio,WilliamRen/libsoundio,gityf/libsoundio,andrewrk/libsoundio,vanloswang/libsoundio,tmatth/libsoundio,WilliamRen/libsoundio,davidgranstrom/libsoundio,andrewrk/libsoundio