png_get_iCCP documentation bug

Hi,

According to libpng.3 about png_get_iCCP(png_ptr, info_ptr, &name,
              &compression_type, &profile, &proflen):

compression_type - The compression type; always
                              PNG_COMPRESSION_TYPE_BASE for PNG 1.0.
                              You may give NULL to this argument to
                              ignore it.

But if NULL is given to this argument then the function returns 0 and
the other output arguments are unchanged as well. It's obvious from the
implementation of this function.

Thanks
Lénárd Szolnoki

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