kernel: usb: xhci-mtk: fix leakage of shared hcd when fail to set wakeup irq

In the Linux kernel, the following vulnerability has been resolved: usb: xhci-mtk: fix leakage of shared hcd when fail to set wakeup irq Can not set the @sharedhcd to NULL before decrease the usage count by usbputhcd, this will cause the shared hcd not released...