ASoC: Intel: avs: Verify content returned by parse_int_array()

ASoC: Intel: avs: Verify content returned by parse_int_array()

The first element of the returned array stores its length. If it is 0,
any manipulation beyond the element at index 0 ends with null-ptr-deref.

Fixes: 5a565ba23abe ("ASoC: Intel: avs: Probing and firmware tracing over debugfs")
Reviewed-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://patch.msgid.link/20250530141025.2942936-8-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>