platform/x86: ISST: unlock on error path in tpmi_sst_init()

Call mutex_unlock(&isst_tpmi_dev_lock) before returning on this
error path.

Fixes: d805456c ("platform/x86: ISST: Enumerate TPMI SST and create framework")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/dcdebbb7-7de6-4d04-8e7a-43d5ca043484@kili.mountainReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c

@@ -1399,8 +1399,10 @@ int tpmi_sst_init(void)
 	isst_common.sst_inst = kcalloc(topology_max_packages(),
 				       sizeof(*isst_common.sst_inst),
 				       GFP_KERNEL);
-	if (!isst_common.sst_inst)
-		return -ENOMEM;
+	if (!isst_common.sst_inst) {
+		ret = -ENOMEM;
+		goto init_done;
+	}
 
 	memset(&cb, 0, sizeof(cb));
 	cb.cmd_size = sizeof(struct isst_if_io_reg);