>>>     CID 1365198:    (REVERSE_INULL)
>>>     Null-checking "zs" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
374     err:    if (zs != NULL &&
375                 (tret = deflateEnd(zs)) != Z_OK && tret != Z_DATA_ERROR)
376                     ret = zlib_error(compressor, session, "deflateEnd", tret);
377             if (last_zs != NULL &&
378                 (tret = deflateEnd(last_zs)) != Z_OK && tret != Z_DATA_ERROR)
379                     ret = zlib_error(compressor, session, "deflateEnd", tret);
/ext/compressors/zlib/zlib_compress.c: 374 in zlib_compress_raw()
368                                 compressor, session, "deflate end block", ret);
369                             goto err;
370                     }
371                     ret = 0;
372             }
373