fix(pubsub): Fixing an integer overflow moved the timestamp by 1s

tests/pubsub/check_pubsub_encoding_json.c

@@ -97,7 +97,7 @@ START_TEST(UA_PubSub_EncodeAllOptionalFields) {
     // then
     ck_assert_int_eq(rv, UA_STATUSCODE_GOOD);
 
-    char* result = "{\"MessageId\":\"ABCDEFGH\",\"MessageType\":\"ua-data\",\"PublisherId\":65535,\"DataSetClassId\":\"00000001-0002-0003-0000-000000000000\",\"Messages\":[{\"DataSetWriterId\":12345,\"SequenceNumber\":4711,\"MetaDataVersion\":{\"MajorVersion\":42,\"MinorVersion\":7},\"Timestamp\":\"1601-01-13T20:38:32.1111111Z\",\"Status\":2764857,\"Payload\":{\"Field1\":{\"Type\":7,\"Body\":27}}}]}";
+    char* result = "{\"MessageId\":\"ABCDEFGH\",\"MessageType\":\"ua-data\",\"PublisherId\":65535,\"DataSetClassId\":\"00000001-0002-0003-0000-000000000000\",\"Messages\":[{\"DataSetWriterId\":12345,\"SequenceNumber\":4711,\"MetaDataVersion\":{\"MajorVersion\":42,\"MinorVersion\":7},\"Timestamp\":\"1601-01-13T20:38:31.1111111Z\",\"Status\":2764857,\"Payload\":{\"Field1\":{\"Type\":7,\"Body\":27}}}]}";
     ck_assert_str_eq(result, (char*)buffer.data);
 
     UA_ByteString_deleteMembers(&buffer);