usb: aspeed-vhub: Fix refcount leak bug in ast_vhub_init_desc()

stable inclusion
from stable-v5.10.137
commit e6db5780c2bf6e23be7b315809ef349b4b4f2213
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I60PLB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e6db5780c2bf6e23be7b315809ef349b4b4f2213

--------------------------------

[ Upstream commit 220fafb4 ]

We should call of_node_put() for the reference returned by
of_get_child_by_name() which has increased the refcount.

Fixes: 30d2617f ("usb: gadget: aspeed: allow to set usb strings in device tree")
Signed-off-by: NLiang He <windhl@126.com>
Link: https://lore.kernel.org/r/20220713120528.368168-1-windhl@126.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>

drivers/usb/gadget/udc/aspeed-vhub/hub.c

@@ -1033,8 +1033,10 @@ static int ast_vhub_init_desc(struct ast_vhub *vhub)
 	/* Initialize vhub String Descriptors. */
 	INIT_LIST_HEAD(&vhub->vhub_str_desc);
 	desc_np = of_get_child_by_name(vhub_np, "vhub-strings");
-	if (desc_np)
+	if (desc_np) {
 		ret = ast_vhub_of_parse_str_desc(vhub, desc_np);
+		of_node_put(desc_np);
+	}
 	else
 		ret = ast_vhub_str_alloc_add(vhub, &ast_vhub_strings);