ALSA: usb-audio: endpoint.c: fix repeated word 'there'

Drop the duplicated word "there".

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: alsa-devel@alsa-project.org
Link: https://lore.kernel.org/r/20201005191244.23902-1-rdunlap@infradead.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>