ALSA: usb-audio: Correct surround channels in UAC1 channel map

USB-audio driver puts SNDRV_CHMAP_SL and _SR as left and right
surround channels for UAC1 channel map, respectively.  But they should
have been SNDRV_CHMAP_RL and _RR; the current value *_SL and _SR are
rather "side" channels, not "surround".  I guess I took those
mistakenly when I read the spec mentioning "surround left".

This patch corrects those entries to be the right channels.

Suggested-by: Sylvain BERTRAND <[email protected]>
Closes: https://lore.kernel.orgZ/qIyJD8lhd8hFhlC@freedom
Fixes: 04324cc ("ALSA: usb-audio: add channel map support")
Cc: <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

Author: tiwai

sound/usb/stream.c

@@ -244,8 +244,8 @@ static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
 		SNDRV_CHMAP_FR,		/* right front */
 		SNDRV_CHMAP_FC,		/* center front */
 		SNDRV_CHMAP_LFE,	/* LFE */
-		SNDRV_CHMAP_SL,		/* left surround */
-		SNDRV_CHMAP_SR,		/* right surround */
+		SNDRV_CHMAP_RL,		/* left surround */
+		SNDRV_CHMAP_RR,		/* right surround */
 		SNDRV_CHMAP_FLC,	/* left of center */
 		SNDRV_CHMAP_FRC,	/* right of center */
 		SNDRV_CHMAP_RC,		/* surround */