[gnome-builder] libide: fix "void function should not return a value"

[Christian Hergert <chergert src gnome org>]

commit 967ea3c452cb12a8d667f004b5651109aff04777
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Sun Mar 29 02:05:24 2015 +0800

    libide: fix "void function should not return a value"
    
    https://bugzilla.gnome.org/show_bug.cgi?id=747187

 libide/ide-fixit.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libide/ide-fixit.c b/libide/ide-fixit.c
index f2ceffa..b06b108 100644
--- a/libide/ide-fixit.c
+++ b/libide/ide-fixit.c
@@ -65,8 +65,8 @@ ide_fixit_ref (IdeFixit *self)
 void
 ide_fixit_unref (IdeFixit *self)
 {
-  g_return_val_if_fail (self, NULL);
-  g_return_val_if_fail (self->ref_count > 0, NULL);
+  g_return_if_fail (self);
+  g_return_if_fail (self->ref_count > 0);
 
   if (g_atomic_int_dec_and_test (&self->ref_count))
     ide_fixit_destroy (self);