musb_ep_get_qh
if (musb_ep_get_qh(hw_ep, is_in) != NULL)
|| musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in);
qh = musb_ep_get_qh(hw_ep, is_in);
struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);