Return value of function, which is statistically inferred to return null, but with no source code available, is dereferenced

Defect 76370 (STATIC_C)
Checker NULL_RETURNS (subcategory unimpl)
File: /src/mongoc/mongoc-stream-tls.c
Function mongoc_stream_tls_new
/src/mongoc/mongoc-stream-tls.c, line: 986
"BIO_new" returns null (checked 2 out of 3 times).

       bio_mongoc_shim = BIO_new (&gMongocStreamTlsRawMethods);

/src/mongoc/mongoc-stream-tls.c, line: 986
Assigning: "bio_mongoc_shim" = null return value from "BIO_new".

       bio_mongoc_shim = BIO_new (&gMongocStreamTlsRawMethods);

/src/mongoc/mongoc-stream-tls.c, line: 1006
Dereferencing a null pointer "bio_mongoc_shim".

       bio_mongoc_shim->ptr = tls;