[gtk+] GtkShaderBuilder Fix copy/paste error in precondition

[Timm Bäder <baedert src gnome org>]

commit 242368bdf6244bb3d636bec384233dbb33cba5d9
Author: Timm Bäder <mail baedert org>
Date:   Thu Mar 16 19:16:24 2017 +0100

    GtkShaderBuilder Fix copy/paste error in precondition
    
    gtk_shader_builder_add_define should check both define_name and
    define_value for not-NULL and not-empty, but the second precondition
    check checks define_name again for not-empty-ness.

 gsk/gskshaderbuilder.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gsk/gskshaderbuilder.c b/gsk/gskshaderbuilder.c
index 65c779a..7085c41 100644
--- a/gsk/gskshaderbuilder.c
+++ b/gsk/gskshaderbuilder.c
@@ -147,7 +147,7 @@ gsk_shader_builder_add_define (GskShaderBuilder *builder,
 {
   g_return_if_fail (GSK_IS_SHADER_BUILDER (builder));
   g_return_if_fail (define_name != NULL && *define_name != '\0');
-  g_return_if_fail (define_value != NULL && *define_name != '\0');
+  g_return_if_fail (define_value != NULL && *define_value != '\0');
 
   g_ptr_array_add (builder->defines, g_strdup (define_name));
   g_ptr_array_add (builder->defines, g_strdup (define_value));