CDRIVER-6125 fix GridFS chunk size handling #2146
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[skip-ci] Tested with this patch build: https://spruce.mongodb.com/version/68e9597d5a19210007dc3e69
See CDRIVER-6125 for details and links to the original report.
Notably: a negative the
length
field does not trigger the same issue. But a check is added to error earlier. Otherwise a negativelength
triggers a later error in_mongoc_gridfs_bucket_read_chunk
. This check could be reverted if it seems unnecessary.