[gnome-builder] buffer: remove extraneous NULL check

[Christian Hergert <chergert src gnome org>]

commit b6a90c530f250294348912d1076900ffaba2f5e2
Author: Christian Hergert <chergert redhat com>
Date:   Wed May 11 10:53:27 2016 +0300

    buffer: remove extraneous NULL check
    
    This should never be NULL, so no need to check for it here.

 libide/ide-buffer.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/libide/ide-buffer.c b/libide/ide-buffer.c
index ae0cf45..d70b0c0 100644
--- a/libide/ide-buffer.c
+++ b/libide/ide-buffer.c
@@ -2267,11 +2267,8 @@ ide_buffer_rehighlight (IdeBuffer *self)
 
   if (gtk_source_buffer_get_highlight_syntax (GTK_SOURCE_BUFFER (self)))
     {
-      if (priv->highlight_engine != NULL)
-        {
-          ide_highlight_engine_rebuild (priv->highlight_engine);
-          IDE_EXIT;
-        }
+      ide_highlight_engine_rebuild (priv->highlight_engine);
+      IDE_EXIT;
     }
 
   ide_highlight_engine_clear (priv->highlight_engine);