Merge pull request #3241 from dscho/fix-fsmonitor-v2-segfault

Fix segmentation fault in the FSMonitor v2 series

Author: dscho

fsmonitor-ipc.c

@@ -53,7 +53,7 @@ int fsmonitor_ipc__send_query(const char *since_token,
 	switch (state) {
 	case IPC_STATE__LISTENING:
 		ret = ipc_client_send_command_to_connection(
-			connection, since_token, strlen(since_token), answer);
+			connection, since_token, since_token ? strlen(since_token) : 0, answer);
 		ipc_client_close_connection(connection);
 
 		trace2_data_intmax("fsm_client", NULL,