[gnome-builder] ctags: fix -Wsign-compare warning

[Christian Hergert <chergert src gnome org>]

commit 2beb00717b8174d8d8b49e22890c577801e2f559
Author: Christian Hergert <chergert redhat com>
Date:   Tue Feb 28 11:44:11 2017 -0800

    ctags: fix -Wsign-compare warning

 plugins/ctags/ide-ctags-symbol-resolver.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/ctags/ide-ctags-symbol-resolver.c b/plugins/ctags/ide-ctags-symbol-resolver.c
index bf1fd33..2da9132 100644
--- a/plugins/ctags/ide-ctags-symbol-resolver.c
+++ b/plugins/ctags/ide-ctags-symbol-resolver.c
@@ -141,7 +141,7 @@ calculate_offset (const gchar *data,
 
   ide_line_reader_init (&reader, (gchar *)data, length);
 
-  while (reader.pos < offset)
+  while (reader.pos < (gssize)offset)
     {
       gsize line_len;