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[ Upstream commit5a985960a4] devm_kasprintf() returns a pointer to dynamically allocated memory which can be NULL upon failure. Ensure the allocation was successful by checking the pointer validity. Fixes:1e4d3ba668("mtd: rawnand: meson: fix the clock") Signed-off-by: Yi Yang <yiyang13@huawei.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20231019065548.318443-1-yiyang13@huawei.com Signed-off-by: Sasha Levin <sashal@kernel.org>