bn: remove TODOs

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15539)

crypto/bn/bn_ctx.c

@@ -11,19 +11,6 @@
 #include "internal/cryptlib.h"
 #include "bn_local.h"
 
-/*-
- * TODO list
- *
- * 1. Check a bunch of "(words+1)" type hacks in various bignum functions and
- * check they can be safely removed.
- *  - Check +1 and other ugliness in BN_from_montgomery()
- *
- * 2. Consider allowing a BN_new_ex() that, at least, lets you specify an
- * appropriate 'block' size that will be honoured by bn_expand_internal() to
- * prevent piddly little reallocations. OTOH, profiling bignum expansions in
- * BN_CTX doesn't show this to be a big issue.
- */
-
 /* How many bignums are in each "pool item"; */
 #define BN_CTX_POOL_SIZE        16
 /* The stack frame info is resizing, set a first-time expansion size; */

crypto/bn/bn_prime.c

@@ -483,7 +483,6 @@ static int probable_prime(BIGNUM *rnd, int bits, int safe, prime_t *mods,
     BN_ULONG maxdelta = BN_MASK2 - primes[trial_divisions - 1];
 
  again:
-    /* TODO: Not all primes are private */
     if (!BN_priv_rand_ex(rnd, bits, BN_RAND_TOP_TWO, BN_RAND_BOTTOM_ODD, 0,
                          ctx))
         return 0;