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

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

[ Upstream commit a39d51ff1f52cd0b6fe7d379ac93bd8b4237d1b7 ]

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: 04324ccc75f9 ("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: Sasha Levin <sashal@kernel.org>