Fix inaccurate comments in bn_prime.c
As well as a coding style nit is fixed.
/*
- * WARNING: do not edit!
- * Generated by crypto/bn/bn_prime.pl
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
@@ -80,7 +78,7 @@ int BN_generate_prime_ex(BIGNUM *ret, int bits, int safe,
goto err;
BN_CTX_start(ctx);
t = BN_CTX_get(ctx);
- if (!t)
+ if (t == NULL)
goto err;
loop:
/* make a random number and set the top and bottom bits */
