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Use devm_clk_get_optional() instead of hand writing it.
This saves some LoC and improves the semantic.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/3debf3bb7ea504ee9ca2d8eb0f948a426681cbdd.1684594240.git.christophe.jaillet@wanadoo.fr

Signed-off-by: Mark Brown <broonie@kernel.org>