[gnome-builder] context: use G_TYPE_CHECK_INSTANCE_TYPE()

[Christian Hergert <chergert src gnome org>]

commit 5fbcad2e13c6a9ef37d5dfdaf08298550ceaea60
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jan 16 19:04:03 2018 -0800

    context: use G_TYPE_CHECK_INSTANCE_TYPE()
    
    This is a a better type instance check since we use the actual value from
    the hash table.

 src/libide/ide-context.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/libide/ide-context.c b/src/libide/ide-context.c
index 2667ccef4..64f2ea85e 100644
--- a/src/libide/ide-context.c
+++ b/src/libide/ide-context.c
@@ -512,7 +512,7 @@ ide_context_get_service_typed (IdeContext *self,
 
   while (g_hash_table_iter_next (&iter, &key, &value))
     {
-      if (g_type_is_a (service_type, GPOINTER_TO_SIZE (key)))
+      if (G_TYPE_CHECK_INSTANCE_TYPE (value, service_type))
         return value;
     }