[openssl/openssl] 5b5ab6: Fix an occasional CI failure due to unaligned access

[Bernd Edlinger]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: 5b5ab6ebe6d8bcb7487112d7382847abffb7c7ed
      https://github.com/openssl/openssl/commit/5b5ab6ebe6d8bcb7487112d7382847abffb7c7ed
  Author: Bernd Edlinger <bernd.edlinger at hotmail.de>
  Date:   2022-10-13 (Thu, 13 Oct 2022)

  Changed paths:
    M crypto/bn/rsaz_exp_x2.c

  Log Message:
  -----------
  Fix an occasional CI failure due to unaligned access

This happens rarely, but only because very few CI runs
use the exotic CPU type that is necessary to execute
anything within rsaz_exp_x2.c and enable UBSAN at the same time.

crypto/bn/rsaz_exp_x2.c:562:20: runtime error: load of misaligned address 0x612000022cc6 for type 'uint64_t' (aka 'unsigned long'), which requires 8 byte alignment
0x612000022cc6: note: pointer points here
 84 a3 78 e0 8e 8d  4a a5 51 9c 57 d0 d6 41  f3 26 d1 4e e1 98 42 b5  3a 9f 04 f1 73 d2 1d bf  73 44
             ^
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/bn/rsaz_exp_x2.c:562:20 in
../../util/wrap.pl ../../fuzz/server-test ../../fuzz/corpora/server => 1
not ok 2 - Fuzzing server

Reviewed-by: Richard Levitte <levitte at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19412)