[gnome-builder] command-bar: fix -Wsign-compare warning

[Christian Hergert <chergert src gnome org>]

commit 3c8a190a73625618759c5d2bce11928b52bdbccd
Author: Christian Hergert <chergert redhat com>
Date:   Tue Feb 28 12:28:32 2017 -0800

    command-bar: fix -Wsign-compare warning

 plugins/command-bar/gb-command-manager.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/plugins/command-bar/gb-command-manager.c b/plugins/command-bar/gb-command-manager.c
index fa54259..de1d7fd 100644
--- a/plugins/command-bar/gb-command-manager.c
+++ b/plugins/command-bar/gb-command-manager.c
@@ -126,14 +126,13 @@ gb_command_manager_complete (GbCommandManager *manager,
                              const gchar      *initial_command_text)
 {
   GPtrArray *completions;
-  int i;
 
   g_return_val_if_fail (GB_IS_COMMAND_MANAGER (manager), NULL);
   g_return_val_if_fail (initial_command_text, NULL);
 
   completions = g_ptr_array_new ();
 
-  for (i = 0; i < manager->providers->len; i++)
+  for (guint i = 0; i < manager->providers->len; i++)
     {
       GbCommandProvider *provider;