ols: Report when a device doesn't support metadata

Not an error, but it does mean it's either a really old or really
basic device, and will help us to debug people's problems with
these.

Fixes bug 92.

hardware/openbench-logic-sniffer/api.c

@@ -148,6 +148,7 @@ static GSList *hw_scan(GSList *options)
 		devc = sdi->priv;
 	} else {
 		/* Not an OLS -- some other board that uses the sump protocol. */
+		sr_info("Device does not support metadata.");
 		sdi = sr_dev_inst_new(0, SR_ST_INACTIVE,
 				"Sump", "Logic Analyzer", "v1.0");
 		sdi->driver = di;