commit 19b94c1f9c9a16d41a8de3ccbdb8536cf1aecdbf upstream.

If 'usb_otg_descriptor_alloc()' fails, we must return an error code, not 0.

Fixes: 56023ce0 ("usb: gadget: audio: allocate and init otg descriptor by otg capabilities")
Reviewed-by: NPeter Chen <peter.chen@nxp.com>
Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: NFelipe Balbi <balbi@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>