[gnome-logs] Avoid segfault when updating latest timestamp

[David King <davidk src gnome org>]

commit 7d0062a4ab36d457b74fe17b8d494570d4a0334b
Author: David King <davidk gnome org>
Date:   Mon Feb 11 08:46:08 2019 +0000

    Avoid segfault when updating latest timestamp
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1652642

 src/gl-journal.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/src/gl-journal.c b/src/gl-journal.c
index 4edb1a6..26815cb 100644
--- a/src/gl-journal.c
+++ b/src/gl-journal.c
@@ -94,8 +94,7 @@ gl_journal_update_latest_timestamp (GlJournal *journal)
         g_warning ("Error retrieving the sender timestamps: %s",
                    g_strerror (-r));
     }
-
-    if (realtime > boot_id->realtime_last)
+    else if (realtime > boot_id->realtime_last)
     {
         boot_id->realtime_last = realtime;
     }