* remote.c (remote_get_noisy_reply): Don't error out on empty

	* remote.c (remote_get_noisy_reply): Don't error out on empty
	replies.
	(remote_start_remote): Update and merge tracepoints and trace
	state variables as long as the target supports tracepoints.
	(remote_trace_init): Fix prototype.
	(remote_download_trace_state_variable): Validate reply.
	(remote_trace_set_readonly_regions): Fix prototype.
	(remote_trace_start): Fix prototype.  Check for empty reply.
	(remote_get_trace_status): Small cleanup.
	(remote_trace_stop): Fix prototype.  Check for empty reply.
	(remote_trace_find): Check for empty reply.
	(remote_save_trace_data): Validate reply.
	(remote_set_disconnected_tracing): Check for empty reply, and
	validate reply.
	(remote_set_circular_trace_buffer): Ditto.