Use the helper function devm_kmemdup() rather than duplicating its
implementation, which helps to enhance code readability.
Signed-off-by: Li Zetao <lizetao1@huawei.com>
Link: https://lore.kernel.org/r/20230810114738.2103792-2-lizetao1@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>