crypt32/tests: Prevent some crashes on Win9x (test_decode_msg).

dlls/crypt32/tests/msg.c

@@ -2022,9 +2022,12 @@ static void test_decode_msg_update(void)
     ok(ret, "CryptMsgUpdate failed: %x\n", GetLastError());
     CryptMsgClose(msg);
 
+    if (have_nt)
+    {
         msg = CryptMsgOpenToDecode(PKCS_7_ASN_ENCODING, 0, 0, 0, NULL, &streamInfo);
         /* Updating a message that has a NULL stream callback fails */
         SetLastError(0xdeadbeef);
+        /* Crashes on some Win9x */
         ret = CryptMsgUpdate(msg, dataEmptyContent, sizeof(dataEmptyContent),
          FALSE);
         todo_wine
@@ -2045,6 +2048,7 @@ static void test_decode_msg_update(void)
          "Expected STATUS_ACCESS_VIOLATION or STATUS_ILLEGAL_INSTRUCTION, got %x\n",
          GetLastError());
         CryptMsgClose(msg);
+    }
 
     /* Empty non-final updates are allowed when streaming.. */
     msg = CryptMsgOpenToDecode(PKCS_7_ASN_ENCODING, 0, 0, 0, NULL, &streamInfo);
@@ -2353,10 +2357,14 @@ static void test_decode_msg_get_param(void)
 
     msg = CryptMsgOpenToDecode(PKCS_7_ASN_ENCODING, 0, 0, 0, NULL, NULL);
     ret = CryptMsgUpdate(msg, hashEmptyContent, sizeof(hashEmptyContent), TRUE);
+    if (ret)
+    {
+        /* Crashes on some Win9x */
         check_param("empty hash content", msg, CMSG_CONTENT_PARAM, NULL, 0);
         check_param("empty hash hash data", msg, CMSG_HASH_DATA_PARAM, NULL, 0);
         check_param("empty hash computed hash", msg, CMSG_COMPUTED_HASH_PARAM,
          emptyHashParam, sizeof(emptyHashParam));
+    }
     CryptMsgClose(msg);
     msg = CryptMsgOpenToDecode(PKCS_7_ASN_ENCODING, 0, 0, 0, NULL, NULL);
     ret = CryptMsgUpdate(msg, hashContent, sizeof(hashContent), TRUE);
@@ -2477,6 +2485,12 @@ static void test_decode_msg_get_param(void)
     msg = CryptMsgOpenToDecode(PKCS_7_ASN_ENCODING, 0, 0, 0, NULL, NULL);
     ret = CryptMsgUpdate(msg, signedKeyIdEmptyContent,
      sizeof(signedKeyIdEmptyContent), TRUE);
+    if (!ret && GetLastError() == OSS_DATA_ERROR)
+    {
+        /* Subsequent tests crashes on some Win9x, so bail out */
+        CryptMsgClose(msg);
+        return;
+    }
     ok(ret, "CryptMsgUpdate failed: %08x\n", GetLastError());
     size = sizeof(value);
     ret = CryptMsgGetParam(msg, CMSG_SIGNER_COUNT_PARAM, 0, &value, &size);