[gnome-applets/wip/muktupavels/werror] brightness: fix -Wint-conversion warning

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 57fe7fe9a071a4cd0727869883c2138e865c74ea
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Apr 4 21:10:33 2020 +0300

    brightness: fix -Wint-conversion warning

 gnome-applets/brightness/brightness-applet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gnome-applets/brightness/brightness-applet.c b/gnome-applets/brightness/brightness-applet.c
index 26c811ac7..76a836de1 100644
--- a/gnome-applets/brightness/brightness-applet.c
+++ b/gnome-applets/brightness/brightness-applet.c
@@ -113,7 +113,7 @@ gpm_applet_size_allocate_cb (GtkWidget    *widget,
                              GdkRectangle *allocation)
 {
        GpmBrightnessApplet *applet = GPM_BRIGHTNESS_APPLET (widget);
-       int               size = NULL;
+       int size = 0;
 
        switch (gp_applet_get_orientation (GP_APPLET (applet))) {
                case GTK_ORIENTATION_VERTICAL: