tracing: fix build error on USB backend

This commit to fix build error due to a wrong syntax in case USBD
highspeed was enabled

Signed-off-by: The Nguyen <the.nguyen.yf@renesas.com>

Author: thenguyenyf

subsys/tracing/tracing_backend_usb.c

@@ -235,7 +235,7 @@ const static __maybe_unused struct usb_desc_header *tracing_func_hs_desc[] = {
 static struct tracing_func_data func_data = {
 	.desc = &func_desc,
 	.fs_desc = tracing_func_fs_desc,
-	.hs_desc = COND_CODE_1(USBD_SUPPORTS_HIGH_SPEED, (tracing_func_hs_desc), (NULL,))
+	.hs_desc = COND_CODE_1(USBD_SUPPORTS_HIGH_SPEED, (tracing_func_hs_desc), (NULL)),
 	.sync_sem = Z_SEM_INITIALIZER(func_data.sync_sem, 0, 1),
 };