ALSA: usx2y: Fix spaces

[ Upstream commit 4c0a58ef ]

This patch corrects merely the spaces in the usx2y code, including the
superfluous trailing space in the debug prints and a slight reformat
of some comment lines.  Nothing really touches about the code itself.

Link: https://lore.kernel.org/r/20210517131545.27252-3-tiwai@suse.de


Signed-off-by: Takashi Iwai <tiwai@suse.de>
Stable-dep-of: dafb28f0 ("ALSA: usx2y: Use snd_card_free_when_closed() at disconnection")
Signed-off-by: Sasha Levin <sashal@kernel.org>