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    Import commit from NetBSD with checkin message: · e1c27cf7
    Kirk McKusick authored
        Avoid Undefined Behavior in ffs_clusteracct()
        Change the type of 'bit' variable from int to unsigned int and use unsigned
        values consistently.
        sys/ufs/ffs/ffs_subr.c:336:10, shift exponent -1 is negative
        Detected with Kernel Undefined Behavior Sanitizer.
        Reported by <Harry Pantazis>
    Submitted by: Pedro Giffuni