chunksize == 0

[DimitriPapadopoulos]

Describe the bug

I'm puzzled by chunksize == 0 in this piece of code:

c-blosc2/blosc/frame.c

Lines 2424 to 2426 in b2434ad

	// Check that we are not appending a small chunk after another small chunk
	int32_t chunk_nbytes_last;
	if (chunksize == 0 && (nchunks > 0) && (chunk_nbytes < (size_t)chunksize)) {

• if chunksize == 0, then chunk_nbytes < (size_t)chunksize) is equivalent to chunk_nbytes < 0)
• chunksize == 0 does not seem consistent with the Check that we are not appending a small chunk after another small chunk comment, but I may be wrong here.