Fix zero-division in pcm_rate.c
Fix zero-division in pcm_rate.c

Patch from Debian bug#539454

Signed-off-by: Takashi Iwai <4596b3305151c7ee743192a95d394341e3d3b644@suse.de>

zedongchen/alsa-lib,gittup/alsa-lib,takaswie/alsa-lib,lgirdwood/alsa-lib,Distrotech/alsa-lib,alsa-project/alsa-lib,mikelima/alsa-lib,Distrotech/alsa-lib,Distrotech/alsa-lib,alsa-project/alsa-lib,gittup/alsa-lib,tiwai/alsa-lib,lgirdwood/alsa-lib,Distrotech/alsa-lib,mengdonglin/alsa-lib,alsa-project/alsa-lib,gittup/alsa-lib,mikelima/alsa-lib,gittup/alsa-lib,takaswie/alsa-lib,mengdonglin/alsa-lib,Distrotech/alsa-lib,tiwai/alsa-lib,mikelima/alsa-lib,lgirdwood/alsa-lib,takaswie/alsa-lib,mikelima/alsa-lib,takaswie/alsa-lib,tiwai/alsa-lib,mikelima/alsa-lib,zedongchen/alsa-lib,zedongchen/alsa-lib,zedongchen/alsa-lib,lgirdwood/alsa-lib,alsa-project/alsa-lib,mengdonglin/alsa-lib,tiwai/alsa-lib,lgirdwood/alsa-lib,zedongchen/alsa-lib,takaswie/alsa-lib,mengdonglin/alsa-lib,mengdonglin/alsa-lib