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All callers from other files ignore the return value of this function. And it can only ever return a non-zero value if the parameter card is NULL. Move the check for card being NULL into snd_card_free_when_closed() to keep the previous behaviour. Note this isn't necessary for snd_card_disconnect_sync() because if card was NULL in there the dereference of card for dev_err() would oops the kernel. Replace this by an oops triggered by the dereference of card for spin_lock_irq(). Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Jaroslav Kysela <perex@perex.cz> Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Acked-by: Geoff Levand <geoff@infradead.org> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/20230207191907.467756-2-u.kleine-koenig@pengutronix.de Signed-off-by: Takashi Iwai <tiwai@suse.de>