bus: arm-integrator-lm: Add of_node_put() before return statement

mainline inclusion
from mainline-v5.11-rc6
commit 1740e673
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7R8MK
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1740e6736922cc1a5d061cc4240d08eacfbbaa71



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

Every iteration of for_each_available_child_of_node() decrements
the reference count of the previous node, however when control is
transferred from the middle of the loop, as in the case of a return
or break or goto, there is no decrement thus ultimately resulting in
a memory leak.

Fix a potential memory leak in arm-integrator-lm.c by inserting
of_node_put() before a return statement.

Issue found with Coccinelle.

Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20200829174154.GA9319@Kaladin
Link: https://lore.kernel.org/r/20210112092549.251548-1-linus.walleij@linaro.org

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Guo Mengqi <guomengqi3@huawei.com>