kernel: asix: fix uninit-value in asix_mdio_read()

In the Linux kernel, the following vulnerability has been resolved: asix: fix uninit-value in asixmdioread asixreadcmd may read less than sizeofsmsr bytes and in this case smsr will be uninitialized. Fail log: BUG: KMSAN: uninit-value in asixcheckhostenable drivers/net/usb/asixcommon.c:82 inline...