The "id" comes from the user.  Change the type to unsigned to prevent
an array underflow.

Fixes: f4ea22f7 ("ASoC: SOF: ipc4: Add support for mtrace log extraction")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/Y8laruWOEwOC/dx9@kiliSigned-off-by: Mark Brown <broonie@kernel.org>