Do not overallocate for tmp.ciphers_raw

Well, not as much, at least.

Commit 07afdf3c changed things so
that for SSLv2 format ClientHellos we store the cipher list in the
TLS format, i.e., with two bytes per cipher, to be consistent with
historical behavior.

However, the space allocated for the array still performed the computation
with three bytes per cipher, a needless over-allocation (though a relatively
small one, all things considered).
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2281)

ssl/statem/statem_srvr.c

@@ -3470,7 +3470,8 @@ STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
          * slightly over allocate because we won't store those. But that isn't a
          * problem.
          */
-        raw = s->s3->tmp.ciphers_raw = OPENSSL_malloc(numciphers * n);
+        raw = OPENSSL_malloc(numciphers * TLS_CIPHER_LEN);
+        s->s3->tmp.ciphers_raw = raw;
         if (raw == NULL) {
             *al = SSL_AD_INTERNAL_ERROR;
             goto err;