libsigrok: Quickfix for a segfault in ChronoVu LA8.

hardware/chronovu-la8/chronovu-la8.c

@@ -684,11 +684,17 @@ static void hw_cleanup(void)
 			sr_warn("la8: %s: sdi was NULL, continuing", __func__);
 			continue;
 		}
+#if 0
+		/*
+		 * Fixes a segfault as it's free()d elsewhere already.
+		 * TODO: Document who is supposed to free this, and when.
+		 */
 		if (sdi->priv != NULL)
 			free(sdi->priv);
 		else
 			sr_warn("la8: %s: sdi->priv was NULL, nothing "
 				"to do", __func__);
+#endif
 		sr_device_instance_free(sdi); /* Returns void. */
 	}
 	g_slist_free(device_instances); /* Returns void. */