PVS-Studio warning V560 for OGDF

//! Specialized default hash function for pointer types.
template<> class DefHashFunc<void *> {
  public:
  size_t hash(const void * &key) const
    { return size_t(key && 0xffffffff); }
};

This suspicious code was found in OGDF project by PVS-Studio static code analyzer.
Warning message is:
V560 A part of conditional expression is always true: 0xffffffff. hashing.h 255

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