[gnome-photos] utils: Remove redundant NULL check

[Debarshi Ray <debarshir src gnome org>]

commit be482e5c10d354a2fdc476d3fa66e47967d575e7
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Jan 18 14:05:16 2018 +0100

    utils: Remove redundant NULL check
    
    gtk_widget_get_screen never returns NULL.

 src/photos-utils.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)
---
diff --git a/src/photos-utils.c b/src/photos-utils.c
index 44f92c38..08625a2b 100644
--- a/src/photos-utils.c
+++ b/src/photos-utils.c
@@ -1287,14 +1287,10 @@ photos_utils_new_app_launch_context_from_widget (GtkWidget *widget)
     goto out;
 
   screen = gtk_widget_get_screen (widget);
-  if (screen != NULL)
-    display = gdk_screen_get_display (screen);
-  else
-    display = gdk_display_get_default ();
+  display = gdk_screen_get_display (screen);
 
   ctx = gdk_display_get_app_launch_context (display);
-  if (screen != NULL)
-    gdk_app_launch_context_set_screen (ctx, screen);
+  gdk_app_launch_context_set_screen (ctx, screen);
 
   ret_val = G_APP_LAUNCH_CONTEXT (g_steal_pointer (&ctx));