clk: mediatek: clk-mt6797: Add check for mtk_alloc_clk_data

stable inclusion
from stable-v4.19.299
commit 4c79cbfb8e9e2311be77182893fda5ea4068c836
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RK78
CVE: CVE-2023-52865

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4c79cbfb8e9e2311be77182893fda5ea4068c836



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

[ Upstream commit 606f6366a35a3329545e38129804d65ef26ed7d2 ]

Add the check for the return value of mtk_alloc_clk_data() in order to
avoid NULL pointer dereference.

Fixes: 96596aa0 ("clk: mediatek: add clk support for MT6797")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/20230912093407.21505-3-jiasheng@iscas.ac.cn


Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zhang Zekun <zhangzekun11@huawei.com>