PVS-Studio warning V610 for HDF5

static void
H5Z_nbit_decompress_one_byte(....)
{
  data[data_offset + k] =
    ((val >> (*buf_len - dat_len)) & ~(~0 << dat_len)) <<
      uchar_offset;
}

This suspicious code was found in HDF5 project by PVS-Studio static code analyzer.
Warning message is:
V610 Undefined behavior. Check the shift operator '<<. The left operand '~0' is negative. h5znbit.c 974

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/