staging: most: sound: remove overcautious argument checking

The interface pointer passed to a component API function cannot be NULL.
This patch removes the unnecessary sanity check of this argument.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Link: https://lore.kernel.org/r/1592924855-25569-6-git-send-email-christian.gromm@microchip.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>