ASoC: SOF: Intel: allow module parameter override BT link to 0

The existing code test if (bt_link_mask_override) to overwrite the BT
link mask. This doesn't allow user to disable the BT link mask. User may
want to disable the BT link when it is detected by the NHLT.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>

Author: bardliao

sound/soc/sof/intel/hda.c

@@ -482,7 +482,7 @@ static int mclk_id_override = -1;
 module_param_named(mclk_id, mclk_id_override, int, 0444);
 MODULE_PARM_DESC(mclk_id, "SOF SSP mclk_id");
 
-static int bt_link_mask_override;
+static int bt_link_mask_override = -1;
 module_param_named(bt_link_mask, bt_link_mask_override, int, 0444);
 MODULE_PARM_DESC(bt_link_mask, "SOF BT offload link mask");
 
@@ -1532,7 +1532,7 @@ struct snd_soc_acpi_mach *hda_machine_select(struct snd_sof_dev *sdev)
 		 mach->mach_params.bt_link_mask);
 
 	/* allow for module parameter override */
-	if (bt_link_mask_override) {
+	if (bt_link_mask_override != -1) {
 		dev_dbg(sdev->dev, "overriding BT link detected in NHLT tables %#x by kernel param %#x\n",
 			mach->mach_params.bt_link_mask, bt_link_mask_override);
 		mach->mach_params.bt_link_mask = bt_link_mask_override;