[retro-gtk/wip/aplazas/controller] core-descriptor: Fix firmware check loop

[Adrien Plazas <aplazas src gnome org>]

commit e0fe9d29fe833ad21d2634fa34da3301c11cebc9
Author: Exalm <exalm7659 gmail com>
Date:   Thu Oct 12 00:27:39 2017 +0500

    core-descriptor: Fix firmware check loop
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788826

 retro-gtk/retro-core-descriptor.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/retro-gtk/retro-core-descriptor.c b/retro-gtk/retro-core-descriptor.c
index b7381ae..995a5b2 100644
--- a/retro-gtk/retro-core-descriptor.c
+++ b/retro-gtk/retro-core-descriptor.c
@@ -322,7 +322,7 @@ retro_core_descriptor_check_platform_group (RetroCoreDescriptor  *self,
     return;
   }
 
-  for (firmware_p = firmwares; firmware_p != NULL; firmware_p++) {
+  for (firmware_p = firmwares; *firmware_p != NULL; firmware_p++) {
     firmware_group = g_strconcat (RETRO_CORE_DESCRIPTOR_FIRMWARE_GROUP_PREFIX, *firmware_p, NULL);
     if (!g_key_file_has_group (self->key_file, firmware_group)) {
       g_set_error (error,