Merge Linux 4.4.289 kernel

Changes in 4.4.289: (19 commits)
        USB: cdc-acm: fix racy tty buffer accesses
        USB: cdc-acm: fix break reporting
        nfsd4: Handle the NFSv4 READDIR 'dircount' hint being zero
        xtensa: call irqchip_init only when CONFIG_USE_OF is selected
        phy: mdio: fix memory leak
        net_sched: fix NULL deref in fifo_set_limit()
        ptp_pch: Load module automatically if ID matches
        ARM: imx6: disable the GIC CPU interface before calling stby-poweroff sequence
        netlink: annotate data races around nlk->bound
        i40e: fix endless loop under rtnl
        gup: document and work around "COW can break either way" issue
        mm: check VMA flags to avoid invalid PROT_NONE NUMA balancing
        HID: apple: Fix logical maximum and usage maximum of Magic Keyboard JIS
        netfilter: ip6_tables: zero-initialize fragment offset
        mac80211: Drop frames from invalid MAC address in ad-hoc mode
        scsi: ses: Fix unsigned comparison with less than zero
        scsi: virtio_scsi: Fix spelling mistake "Unsupport" -> "Unsupported"
        perf/x86: Reset destroy callback on event init failure
        Linux 4.4.289