pbkdf2: change FIPS zeroization to use the OPENSSL_PEDANTIC_ZEROIZATION define

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26068)

providers/implementations/kdfs/pbkdf2.c

@@ -93,7 +93,7 @@ static void *kdf_pbkdf2_new(void *provctx)
 static void kdf_pbkdf2_cleanup(KDF_PBKDF2 *ctx)
 {
     ossl_prov_digest_reset(&ctx->digest);
-#ifdef FIPS_MODULE
+#ifdef OPENSSL_PEDANTIC_ZEROIZATION
     OPENSSL_clear_free(ctx->salt, ctx->salt_len);
 #else
     OPENSSL_free(ctx->salt);