Bluetooth: fix strncpy call in bt_set_name

In bt_set_name we already get name length so let's use it in strncpy
Also fix warning with enable -Wstringop-truncation

Signed-off-by: Ilya Averyanov <[email protected]>

Author: a1ien

subsys/bluetooth/host/hci_core.c

@@ -6723,20 +6723,21 @@ int bt_set_name(const char *name)
 	size_t len = strlen(name);
 	int err;
 
-	if (len >= sizeof(bt_dev.name)) {
+	if (len > CONFIG_BT_DEVICE_NAME_MAX) {
 		return -ENOMEM;
 	}
 
 	if (!strcmp(bt_dev.name, name)) {
 		return 0;
 	}
 
-	strncpy(bt_dev.name, name, sizeof(bt_dev.name));
+	strncpy(bt_dev.name, name, len);
+	bt_dev.name[len] = '\0';
 
 	/* Update advertising name if in use */
 	if (adv && atomic_test_bit(adv->flags, BT_ADV_INCLUDE_NAME)) {
 		struct bt_data data[] = { BT_DATA(BT_DATA_NAME_COMPLETE, name,
-						strlen(name)) };
+						len) };
 		struct bt_ad sd = { data, ARRAY_SIZE(data) };
 
 		set_sd(adv, &sd, 1);