can: rcar_canfd: Use dev_err_probe() to simplify code and better handle -EPROBE_DEFER

devm_clk_get() can return -EPROBE_DEFER, so use dev_err_probe() instead of
dev_err() in order to be less verbose in the log.

This also saves a few LoC.

While at it, turn a "goto fail_dev;" at the beginning of the function into
a direct return in order to avoid mixing goto and return, which looks
spurious.

Signed-off-by: Christophe JAILLET <[email protected]>
Link: https://lore.kernel.org/all/f5bf0b8f757bd3bc9b391094ece3548cc2f96456.1659858686.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Marc Kleine-Budde <[email protected]>

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