mediatek: mt76: mac80211: Fix missing of_node_put() in mt76_led_init()

stable inclusion
from stable-v5.10.137
commit 9aa4ad5ccabcfc906c77dbc7d0e2b2c28f1357c6
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=9aa4ad5ccabcfc906c77dbc7d0e2b2c28f1357c6



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[ Upstream commit 0a14c1d0 ]

We should use of_node_put() for the reference 'np' returned by
of_get_child_by_name() which will increase the refcount.

Fixes: 17f1de56 ("mt76: add common code shared between multiple chipsets")
Signed-off-by: Liang He <windhl@126.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>