linuxkm/module_exports.c.template: add wolfssl/wolfcrypt/wc_slhdsa.h.

wolfcrypt/src/wc_slhdsa.c:

  * refactor SAVE_VECTOR_REGISTERS2() in slhdsakey_fors_sign() as
    CAN_SAVE_VECTOR_REGISTERS(), with local save-restore wrappers around the
    rest of the vector calls deeper in the call stack, to avoid failing
    GFP_ATOMIC allocations and long spans with interrupts disabled.

  * fix numerous bugprone-macro-parentheses and bugprone-signed-char-misuses.

  * use readUnalignedWord64() in SHAKE256_SET_SEED_HA_X4_*() and
    slhdsakey_shake256_set_seed_ha_x4() to avoid benign unaligned access warnings
    from sanitizers.

wolfcrypt/test/test.c:

  * in TestDumpData(), use WOLFSSL_DEBUG_PRINTF(), not fprintf(stderr, ...), for
    portability.

  * in slhdsa_test_param() and slhdsa_test(), use WC_DECLARE_VAR() and friends
    for SlhDsaKey allocations, and use ERROR_OUT() and single-return-point
    refactors to fix error path memory leaks.

Author: douzzer

linuxkm/module_exports.c.template

@@ -176,6 +176,9 @@
 #ifdef HAVE_DILITHIUM
     #include <wolfssl/wolfcrypt/dilithium.h>
 #endif
+#ifdef WOLFSSL_HAVE_SLHDSA
+    #include <wolfssl/wolfcrypt/wc_slhdsa.h>
+#endif
 
 #ifdef OPENSSL_EXTRA
   #ifndef WOLFCRYPT_ONLY