[mutter] display: Fix a possible bug in meta_display_sync_wayland_focus

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 0d50a37091244e7c61e1e99857cd1a1b531d4911
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Sun Apr 14 17:15:06 2019 +0200

    display: Fix a possible bug in meta_display_sync_wayland_focus
    
    The check for the focus xwindow is called, but not used. Fix that by
    renaming the variable to reflect better what it does and actually using
    the return value of the check.
    
    This was the original intention of the author in commit
    05899596d10918df5359d89baa82e6fedd0ae208 and got broken in commit
    8e7e1eeef59c4f74046e6783b6334c1432255c5a.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/535

 src/core/display.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/core/display.c b/src/core/display.c
index 819c61d5c..adef7de5d 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -1214,15 +1214,15 @@ meta_display_sync_wayland_input_focus (MetaDisplay *display)
   MetaWindow *focus_window = NULL;
   MetaBackend *backend = meta_get_backend ();
   MetaStage *stage = META_STAGE (meta_backend_get_stage (backend));
-  gboolean is_focus_xwindow = FALSE;
+  gboolean is_no_focus_xwindow = FALSE;
 
   if (display->x11_display)
-    meta_x11_display_xwindow_is_a_no_focus_window (display->x11_display,
-                                                   display->x11_display->focus_xwindow);
+    is_no_focus_xwindow = meta_x11_display_xwindow_is_a_no_focus_window (display->x11_display,
+                                                                         
display->x11_display->focus_xwindow);
 
   if (!meta_display_windows_are_interactable (display))
     focus_window = NULL;
-  else if (is_focus_xwindow)
+  else if (is_no_focus_xwindow)
     focus_window = NULL;
   else if (display->focus_window && display->focus_window->surface)
     focus_window = display->focus_window;