[gtk-vnc] Avoid comparing display to self in gdk stubs

[Daniel P. Berrange <dberrange src gnome org>]

commit 62c1f50c017391f55211282ef6c015049e752f98
Author: Daniel P. Berrange <berrange redhat com>
Date:   Thu Jul 21 10:55:08 2016 +0100

    Avoid comparing display to self in gdk stubs
    
    Latest gcc warns about the comparison 'dpy == dpy'
    
    vncdisplaykeymap.c: In function 'vnc_display_keymap_gdk2rfb_table':
    vncdisplaykeymap.c:165:14: error: self-comparison always evaluates to true [-Werror=tautological-compare]
         if (GDK_IS_X11_DISPLAY(dpy)) {
                  ^~
    
    Change to using 'dpy != NULL' to avoid this.
    
    Signed-off-by: Daniel P. Berrange <berrange redhat com>

 src/vncdisplaykeymap.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/vncdisplaykeymap.c b/src/vncdisplaykeymap.c
index 4ed058d..efdf44a 100644
--- a/src/vncdisplaykeymap.c
+++ b/src/vncdisplaykeymap.c
@@ -86,7 +86,7 @@ static unsigned int ref_count_for_untranslated_keys = 0;
 
 /* Gtk2 compat */
 #ifndef GDK_IS_X11_DISPLAY
-#define GDK_IS_X11_DISPLAY(dpy) (dpy == dpy)
+#define GDK_IS_X11_DISPLAY(dpy) (dpy != NULL)
 #endif
 #endif
 
@@ -96,7 +96,7 @@ static unsigned int ref_count_for_untranslated_keys = 0;
 
 /* Gtk2 compat */
 #ifndef GDK_IS_WIN32_DISPLAY
-#define GDK_IS_WIN32_DISPLAY(dpy) (dpy == dpy)
+#define GDK_IS_WIN32_DISPLAY(dpy) (dpy != NULL)
 #endif
 #endif
 
@@ -106,7 +106,7 @@ static unsigned int ref_count_for_untranslated_keys = 0;
 
 /* Gtk2 compat */
 #ifndef GDK_IS_BROADWAY_DISPLAY
-#define GDK_IS_BROADWAY_DISPLAY(dpy) (dpy == dpy)
+#define GDK_IS_BROADWAY_DISPLAY(dpy) (dpy != NULL)
 #endif
 
 #endif
@@ -117,7 +117,7 @@ static unsigned int ref_count_for_untranslated_keys = 0;
 
 /* Gtk2 compat */
 #ifndef GDK_IS_QUARTZ_DISPLAY
-#define GDK_IS_QUARTZ_DISPLAY(dpy) (dpy == dpy)
+#define GDK_IS_QUARTZ_DISPLAY(dpy) (dpy != NULL)
 #endif
 #endif