ALSA: usb-audio: Stop parsing channels bits when all channels are found.

stable inclusion
from stable-v5.10.214
commit 5cd466673b34bac369334f66cbe14bb77b7d7827
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9Q91N
CVE: CVE-2024-27436

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5cd466673b34bac369334f66cbe14bb77b7d7827



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If a usb audio device sets more bits than the amount of channels
it could write outside of the map array.

Signed-off-by: Johan Carlsson <johan.carlsson@teenage.engineering>
Fixes: 04324ccc ("ALSA: usb-audio: add channel map support")
Message-ID: <20240313081509.9801-1-johan.carlsson@teenage.engineering>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Yuan Can <yuancan@huawei.com>