[gtk+] wayland: Mark private function as static

[Emmanuele Bassi <ebassi src gnome org>]

commit 82800fae52ef1940780f8bc9692d9d96df265371
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Apr 28 22:21:19 2017 +0100

    wayland: Mark private function as static
    
    The selection_lookup_offer_by_atom() function is private to the file and
    not used elsewhere.

 gdk/wayland/gdkselection-wayland.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/wayland/gdkselection-wayland.c b/gdk/wayland/gdkselection-wayland.c
index b31af85..b98caa8 100644
--- a/gdk/wayland/gdkselection-wayland.c
+++ b/gdk/wayland/gdkselection-wayland.c
@@ -479,7 +479,7 @@ static const struct gtk_primary_selection_offer_listener primary_offer_listener
   primary_offer_offer,
 };
 
-SelectionData *
+static SelectionData *
 selection_lookup_offer_by_atom (GdkWaylandSelection *selection,
                                 GdkAtom              selection_atom)
 {