ASoC: Intel: Add NULL checks for the stream pointer

We should not send IPC stream commands to FW when the stream is
NULL, dereference the NULL pointer may also occur without precheck.
Here add NULL pointer checks for these stream APIs.

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed