[gtk+] x11: Use g_error_matches()

[Benjamin Otte <otte src gnome org>]

commit 318a9c4634c7ac2eb8f46d29a1b1f32ae5f1ab5a
Author: Benjamin Otte <otte redhat com>
Date:   Sun Mar 20 05:43:02 2016 +0100

    x11: Use g_error_matches()
    
    Fixes accidentally assigning values.
    
    http://www.viva64.com/en/b/0383/

 gdk/x11/gdkselection-x11.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gdk/x11/gdkselection-x11.c b/gdk/x11/gdkselection-x11.c
index b84be26..c4e7322 100644
--- a/gdk/x11/gdkselection-x11.c
+++ b/gdk/x11/gdkselection-x11.c
@@ -738,8 +738,7 @@ gdk_x11_display_utf8_to_compound_text (GdkDisplay  *display,
 
       if (!locale_str)
         {
-          if (!(error->domain = G_CONVERT_ERROR &&
-                error->code == G_CONVERT_ERROR_ILLEGAL_SEQUENCE))
+          if (!g_error_matches (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE))
             {
               g_warning ("Error converting from UTF-8 to '%s': %s",
                          charset, error->message);