staging: most: sound: correct label name

This patch fixes the lable name that is used to jump to error
handling section of function audio_probe_channel() in case
something went wrong.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>