[mod_openssl] fix crash with libressl or openssl < 1.1

Change-Id: I920ab1e4bc36df8396dcbf3d5777af32ae273a8b

src/modules/openssl_filter.c

@@ -132,6 +132,7 @@ static BIO_METHOD chunkqueue_bio_method = {
 static BIO* new_cq_bio(liOpenSSLFilter *f) {
 	BIO *bio = BIO_new(&chunkqueue_bio_method);
 	bio->ptr = f;
+	return bio;
 }
 
 #else