[HarfBuzz] Pointer initialization from false

[Kenichi Ishibashi]

Hi Behdad,

The current revision can't compile with clang++ if -Werror option is
specified.

src/hb-open-type-private.hh:437:93: error: initialization of pointer of
type 'OT::GenericArrayOf<OT::IntType<unsigned short>,
OT::OffsetTo<OT::LigatureSet> > *' to null from a constant boolean
expression [-Werror,-Wbool-conversion]
    if (unlikely (!this->allocate_size<Type> (((char *) &obj) + size -
this->head))) return false

I'd appreciate if you could use NULL instead of false here.

Thanks,
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