Assertion contains an operation with a side effect

Defect 76624 (STATIC_C)
Checker ASSERT_SIDE_EFFECT (subcategory none)
File: /src/mongoc/mongoc-gridfs-file.c
Function _mongoc_gridfs_file_extend
/src/mongoc/mongoc-gridfs-file.c, line: 601
Assignment "file->length = target_length" has a side effect. This code will work differently in a non-debug build.

       BSON_ASSERT (file->length = target_length);