Add error check after retrieving PEQ filter values in
scarlett2_update_filter_values that ensure function returns error if
PEQ filter value retrieval fails.

Fixes: b64678eb ("ALSA: scarlett2: Add DSP controls")
Signed-off-by: Zhu Jun <zhujun2@cmss.chinamobile.com>
Cc: <stable@vger.kernel.org>
Link: https://patch.msgid.link/20241009092305.8570-1-zhujun2@cmss.chinamobile.comSigned-off-by: Takashi Iwai <tiwai@suse.de>