[polari] main: Add missing sentinel

[Florian Müllner <fmuellner src gnome org>]

commit 6d5a6b936d2bcc31a24c122ab66960b302a6e627
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Jul 26 00:29:31 2018 +0200

    main: Add missing sentinel
    
    Ugh, how did I manage to miss that :-(

 src/polari.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/polari.c b/src/polari.c
index 066680f..30f4367 100644
--- a/src/polari.c
+++ b/src/polari.c
@@ -21,7 +21,8 @@ main (int argc, char *argv[])
 
   GOptionEntry entries[] =
     {
-      { "debugger", 'd', 0, G_OPTION_ARG_NONE, &debugger, NULL, NULL }
+      { "debugger", 'd', 0, G_OPTION_ARG_NONE, &debugger, NULL, NULL },
+      { NULL }
     };
 
   g_irepository_prepend_search_path (PKGLIBDIR);