src/pcm/pcm_multi.c: add missing free
src/pcm/pcm_multi.c: add missing free

Something that is allocated using calloc is not freed on an error path.

Signed-off-by: Julia Lawall <b43b0ad1e8108e7ab870d7a54feac93ae8b8600e@diku.dk>
Signed-off-by: Suman Saha <0e866a2b4e1274e45e46c4d056f41d10e05ff4a1@gmail.com>
Signed-off-by: Takashi Iwai <4596b3305151c7ee743192a95d394341e3d3b644@suse.de>

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