[gnome-builder] color-picker: fix -Wsign-compare warning

[Christian Hergert <chergert src gnome org>]

commit 8c3b00763c8904a4fd8194a66888fa3f3c9100c0
Author: Christian Hergert <chergert redhat com>
Date:   Tue Feb 28 12:30:06 2017 -0800

    color-picker: fix -Wsign-compare warning

 .../gb-color-picker-document-monitor.c             |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/plugins/color-picker/gb-color-picker-document-monitor.c 
b/plugins/color-picker/gb-color-picker-document-monitor.c
index cc0b24d..0b0e02b 100644
--- a/plugins/color-picker/gb-color-picker-document-monitor.c
+++ b/plugins/color-picker/gb-color-picker-document-monitor.c
@@ -133,7 +133,6 @@ gb_color_picker_document_monitor_uncolorize (GbColorPickerDocumentMonitor *self,
   GtkTextTag *color_tag;
   GtkTextTag *tag;
   GSList *l;
-  gint n;
 
   g_return_if_fail (GB_IS_COLOR_PICKER_DOCUMENT_MONITOR (self));
   g_return_if_fail (self->buffer != NULL);
@@ -143,7 +142,7 @@ gb_color_picker_document_monitor_uncolorize (GbColorPickerDocumentMonitor *self,
     {
       taglist = g_ptr_array_new ();
       gtk_text_tag_table_foreach (tag_table, (GtkTextTagTableForeach)remove_color_tag_foreach_cb, taglist);
-      for (n = 0; n < taglist->len; ++n)
+      for (guint n = 0; n < taglist->len; ++n)
         gtk_text_tag_table_remove (tag_table, g_ptr_array_index (taglist, n));
 
       return;
@@ -204,7 +203,6 @@ gb_color_picker_document_monitor_colorize (GbColorPickerDocumentMonitor *self,
   GtkTextIter tag_end;
   gint offset;
   gint len;
-  gint n;
   gint pos;
 
   g_return_if_fail (GB_IS_COLOR_PICKER_DOCUMENT_MONITOR (self));
@@ -227,7 +225,7 @@ gb_color_picker_document_monitor_colorize (GbColorPickerDocumentMonitor *self,
   text = gtk_text_buffer_get_slice (GTK_TEXT_BUFFER (self->buffer), &real_begin, &real_end, TRUE);
 
   items = gstyle_color_parse (text);
-  for (n = 0; n < items->len; ++n)
+  for (guint n = 0; n < items->len; ++n)
     {
       item = g_ptr_array_index (items, n);
       pos = offset + gstyle_color_item_get_start (item);