[gtk+] Fix the build

[Emmanuele Bassi <ebassi src gnome org>]

commit 66f7f1768fc95c51ab346cacf7259cdaebc68ff2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Dec 5 11:02:20 2017 +0000

    Fix the build
    
    Use the right argument name in the preconditions check.

 gdk/gdkclipboard.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkclipboard.c b/gdk/gdkclipboard.c
index 61f24bf..63bd629 100644
--- a/gdk/gdkclipboard.c
+++ b/gdk/gdkclipboard.c
@@ -1002,7 +1002,7 @@ gdk_clipboard_read_text_finish (GdkClipboard  *clipboard,
   const GValue *value;
 
   g_return_val_if_fail (g_task_is_valid (result, clipboard), NULL);
-  g_return_val_if_fail (g_task_get_source_tag (G_TASK (res)) == gdk_clipboard_read_text_async, NULL);
+  g_return_val_if_fail (g_task_get_source_tag (G_TASK (result)) == gdk_clipboard_read_text_async, NULL);
   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
 
   value = g_task_propagate_pointer (G_TASK (result), error);