Merge Linux 4.4.296 kernel

Changes in 4.4.296: (24 commits)
        nfc: fix segfault in nfc_genl_dump_devices_done
        parisc/agp: Annotate parisc agp init functions with __init
        i2c: rk3x: Handle a spurious start completion interrupt flag
        net: netlink: af_netlink: Prevent empty skb by adding a check on len.
        hwmon: (dell-smm) Fix warning on /proc/i8k creation error
        mac80211: send ADDBA requests using the tid/queue of the aggregation session
        recordmcount.pl: look for jgnop instruction as well as bcrl on s390
        dm btree remove: fix use after free in rebalance_children()
        nfsd: fix use-after-free due to delegation race
        soc/tegra: fuse: Fix bitwise vs. logical OR warning
        igbvf: fix double free in `igbvf_probe`
        USB: gadget: bRequestType is a bitfield, not a enum
        PCI/MSI: Clear PCI_MSIX_FLAGS_MASKALL on error
        USB: serial: option: add Telit FN990 compositions
        timekeeping: Really make sure wall_to_monotonic isn't positive
        net: systemport: Add global locking for descriptor lifecycle
        net: lan78xx: Avoid unnecessary self assignment
        ARM: 8805/2: remove unneeded naked function usage
        Input: touchscreen - avoid bitwise vs logical OR warning
        xen/blkfront: harden blkfront against event channel storms
        xen/netfront: harden netfront against event channel storms
        xen/console: harden hvc_xen against event channel storms
        xen/netback: don't queue unlimited number of packages
        Linux 4.4.296