Merge Linux 4.4.234 kernel

Changes in 4.4.234: (35 commits)
        drm/imx: imx-ldb: Disable both channels for split mode in enc->disable()
        perf probe: Fix memory leakage when the probe point is not found
        net/compat: Add missing sock updates for SCM_RIGHTS
        watchdog: f71808e_wdt: indicate WDIOF_CARDRESET support in watchdog_info.options
        watchdog: f71808e_wdt: remove use of wrong watchdog_info option
        coredump: fix race condition between collapse_huge_page() and core dumping
        khugepaged: khugepaged_test_exit() check mmget_still_valid()
        khugepaged: adjust VM_BUG_ON_MM() in __khugepaged_enter()
        btrfs: export helpers for subvolume name/id resolution
        btrfs: don't show full path of bind mounts in subvol=
        romfs: fix uninitialized memory leak in romfs_dev_read()
        mm: include CMA pages in lowmem_reserve at boot
        mm, page_alloc: fix core hung in free_pcppages_bulk()
        ext4: clean up ext4_match() and callers
        ext4: fix checking of directory entry validity for inline directories
        media: budget-core: Improve exception handling in budget_register()
        media: vpss: clean up resources in init
        Input: psmouse - add a newline when printing 'proto' by sysfs
        m68knommu: fix overwriting of bits in ColdFire V3 cache control
        xfs: fix inode quota reservation checks
        jffs2: fix UAF problem
        scsi: libfc: Free skb in fc_disc_gpn_id_resp() for valid cases
        virtio_ring: Avoid loop when vq is broken in virtqueue_poll
        xfs: Fix UBSAN null-ptr-deref in xfs_sysfs_init
        alpha: fix annotation of io{read,write}{16,32}be()
        ext4: fix potential negative array index in do_split()
        ASoC: intel: Fix memleak in sst_media_open
        powerpc: Allow 4224 bytes of stack expansion for the signal frame
        epoll: Keep a reference on files added to the check list
        do_epoll_ctl(): clean the failure exits up a bit
        mm/hugetlb: fix calculation of adjust_range_if_pmd_sharing_possible
        xen: don't reschedule in preemption off sections
        omapfb: dss: Fix max fclk divider for omap36xx
        KVM: arm/arm64: Don't reschedule in unmap_stage2_range()
        Linux 4.4.234