ASoC: soc-ac97: Fix the incorrect description

ASoC: soc-ac97: Fix the incorrect description

In the function snd_soc_alloc_ac97_component &
snd_soc_new_ac97_component, the error return is
ERR_PTR, so fix the incorrect description.

Fixes: 47e039413cac ("ASoC: Add support for allocating AC'97 device before registering it")
Fixes: 7361fbeaeaab ("ASoC: ac97: Add support for resetting device before registration")
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://patch.msgid.link/20240910013303.2044-1-tangbin@cmss.chinamobile.com
Signed-off-by: Mark Brown <broonie@kernel.org>