[gnome-builder] completion: use proper unref function for providers

[Christian Hergert <chergert src gnome org>]

commit 3a4f37988d0a0945ba4e3e6a22745371083803f5
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jun 14 04:29:15 2018 -0700

    completion: use proper unref function for providers

 src/libide/completion/ide-completion-context.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/libide/completion/ide-completion-context.c b/src/libide/completion/ide-completion-context.c
index 4a7219d9b..d90ab88f5 100644
--- a/src/libide/completion/ide-completion-context.c
+++ b/src/libide/completion/ide-completion-context.c
@@ -175,7 +175,7 @@ ide_completion_context_dispose (GObject *object)
 {
   IdeCompletionContext *self = (IdeCompletionContext *)object;
 
-  g_clear_pointer (&self->providers, g_ptr_array_unref);
+  g_clear_pointer (&self->providers, g_array_unref);
   g_clear_object (&self->completion);
 
   if (self->begin_mark != NULL)