usb: gadget: u_audio: disable eps when usb disconnect

UAC gadget disable eps only when receiving set_alt_0. If USB is
unplugged before the packet of set_alt_0, the corresponding eps
will not be released and leading to UAC dysfunction when the next
time the usb is plugged.

Signed-off-by: Ren Jianing <jianing.ren@rock-chips.com>
Change-Id: I476ef8ce64a5b04cc3fec32a28126e2eb9d5ad78

Author: RenJianing

drivers/usb/gadget/function/u_audio.c

@@ -909,6 +909,9 @@ void g_audio_cleanup(struct g_audio *g_audio)
 	if (card)
 		snd_card_free(card);
 
+	free_ep(&uac->c_prm, g_audio->out_ep);
+	free_ep(&uac->p_prm, g_audio->in_ep);
+
 	kfree(uac->p_prm.ureq);
 	kfree(uac->c_prm.ureq);
 	kfree(uac->p_prm.rbuf);