[gdk-pixbuf] Silence two compiler warnings

[Emmanuele Bassi <ebassi src gnome org>]

commit 4efa0dd16c42d89cb722ca7a482e37afe4430f97
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sun Apr 29 18:07:52 2018 +0100

    Silence two compiler warnings
    
    We have two "set but unused variable" warnings coming from
    gdk-pixbuf-xlib. The first is caused by an unnecessary variable used to
    hold the return value of XGetWindowAttributes(); we don't do anything
    with it, and it's way too late for changing the behaviour of the
    function to bail out on error. The second is caused by a variable that
    is only used when a debugging printf() is compiled in; to avoid the
    warning without creating even more complex macro hell, we tell the
    compiler that the variable is unused.

 contrib/gdk-pixbuf-xlib/gdk-pixbuf-xlibrgb.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/contrib/gdk-pixbuf-xlib/gdk-pixbuf-xlibrgb.c b/contrib/gdk-pixbuf-xlib/gdk-pixbuf-xlibrgb.c
index dfde1ae..eeb1559 100644
--- a/contrib/gdk-pixbuf-xlib/gdk-pixbuf-xlibrgb.c
+++ b/contrib/gdk-pixbuf-xlib/gdk-pixbuf-xlibrgb.c
@@ -664,10 +664,9 @@ xlib_rgb_choose_visual_for_xprint (int aDepth)
   int i;
 
   XWindowAttributes win_att;
-  Status ret_stat;
   Visual      *root_visual;
 
-  ret_stat = XGetWindowAttributes(image_info->display, 
+  XGetWindowAttributes(image_info->display,
                        RootWindow(image_info->display, image_info->screen_num),
                        &win_att);
   root_visual = win_att.visual;
@@ -712,7 +711,7 @@ xlib_rgb_set_gray_cmap (Colormap cmap)
 {
   int i;
   XColor color;
-  int status;
+  Status status G_GNUC_UNUSED;
   unsigned long pixels[256];
   int r, g, b, gray;