[retro-gtk/wip/aplazas/c-port] Fixes

[Adrien Plazas <aplazas src gnome org>]

commit 0f136eb274024d005ff7cb493ce2c61f404d4b9e
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Tue Oct 10 11:33:16 2017 +0200

    Fixes

 retro-gtk/retro-core-descriptor.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/retro-gtk/retro-core-descriptor.c b/retro-gtk/retro-core-descriptor.c
index f92ab16..ea03a85 100644
--- a/retro-gtk/retro-core-descriptor.c
+++ b/retro-gtk/retro-core-descriptor.c
@@ -729,7 +729,7 @@ retro_core_descriptor_has_firmware_sha512 (RetroCoreDescriptor  *self,
  * retro_core_descriptor_get_mime_type
  * @self: a #RetroCoreDescriptor
  * @platform: a platform name
- * @length (out) (optional): return location for the number of returned strings,
+ * @length: (out) (nullable): return location for the number of returned strings,
  * or %NULL
  * @error: return location for a #GError, or %NULL
  *
@@ -757,7 +757,7 @@ retro_core_descriptor_get_mime_type (RetroCoreDescriptor  *self,
  * retro_core_descriptor_get_firmwares
  * @self: a #RetroCoreDescriptor
  * @platform: a platform name
- * @length: (out) (optional): return location for the number of returned
+ * @length: (out) (nullable): return location for the number of returned
  * strings, or %NULL
  * @error: return location for a #GError, or %NULL
  *