topology: decode: Fix channel map memory allocation
topology: decode: Fix channel map memory allocation

Memory allocated on the stack was referenced outside of the function scope
caused undefined behaviour.

Signed-off-by: Piotr Maziarz <0604caaac05eeae025300dfb7c027c7c21eb9047@linux.intel.com>
Reviewed-by: Cezary Rojewski <edc7704b7060e799e355e4fa5ede84b3fb458598@intel.com>
Reviewed-by: Amadeusz Sławiński <cb61efdbc37969c3cec75aa88813451bc89103ff@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <96763a6a2df29d49945016061de78f7ac9cbfcc5@linux.intel.com>
Signed-off-by: Jaroslav Kysela <72edd5e1a572f82f059ccbb83c92b74d6cb051ff@perex.cz>

takaswie/alsa-lib,alsa-project/alsa-lib,alsa-project/alsa-lib,tiwai/alsa-lib,tiwai/alsa-lib,takaswie/alsa-lib,takaswie/alsa-lib,tiwai/alsa-lib,takaswie/alsa-lib,alsa-project/alsa-lib,alsa-project/alsa-lib,tiwai/alsa-lib,takaswie/alsa-lib