[geary/wip/fix-warnings: 2/2] Fix valac warning

[Michael Gratton <mjog src gnome org>]

commit 3fb74e6e5625fcb5f11d9b0bb83015969ed52799
Author: Michael Gratton <mike vee net>
Date:   Fri May 24 12:27:36 2019 +0200

    Fix valac warning

 src/engine/api/geary-logging.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/engine/api/geary-logging.vala b/src/engine/api/geary-logging.vala
index 79345713..652b7005 100644
--- a/src/engine/api/geary-logging.vala
+++ b/src/engine/api/geary-logging.vala
@@ -110,7 +110,7 @@ private Record? first_record = null;
 private Record? last_record = null;
 private uint log_length = 0;
 private uint max_log_length = 0;
-private LogRecord? listener = null;
+private unowned LogRecord? listener = null;
 
 
 /**