ALSA: usb-audio: Remove the repeated declaration

Function 'snd_usb_endpoint_suspend' is declared twice, so remove the
repeated declaration.
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Link: https://lore.kernel.org/r/1622278926-63857-1-git-send-email-zhangshaokun@hisilicon.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/endpoint.h

@@ -19,7 +19,6 @@ void snd_usb_endpoint_close(struct snd_usb_audio *chip,
 			    struct snd_usb_endpoint *ep);
 int snd_usb_endpoint_configure(struct snd_usb_audio *chip,
 			       struct snd_usb_endpoint *ep);
-void snd_usb_endpoint_suspend(struct snd_usb_endpoint *ep);
 
 bool snd_usb_endpoint_compatible(struct snd_usb_audio *chip,
 				 struct snd_usb_endpoint *ep,