[cogl] Revert "cogl-buffer: Stop warning spam running in sw rendering"

[Robert Bragg <rbragg src gnome org>]

commit 8c5127c712570f1ea0d495a7fe7290ae5ee60ce6
Author: Robert Bragg <robert linux intel com>
Date:   Wed Mar 6 16:37:19 2013 +0000

    Revert "cogl-buffer: Stop warning spam running in sw rendering"
    
    This reverts commit 83dbf79986981fac9ec0f2575b7c7cb32f629f0f.
    
    On further consideration we realized that needing this change either
    indicated a bug in the code using cogl, or that it was a symptom of
    some other bug in Cogl resulting in us returning NULL in
    cogl_buffer_map_range but not returning a CoglError too.
    
    Reviewed-by: Neil Roberts <neil linux intel com>

 cogl/cogl-buffer.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/cogl/cogl-buffer.c b/cogl/cogl-buffer.c
index 6aa10dd..4edfa54 100644
--- a/cogl/cogl-buffer.c
+++ b/cogl/cogl-buffer.c
@@ -290,8 +290,7 @@ _cogl_buffer_map_range_for_fill_or_fallback (CoglBuffer *buffer,
   if (ret)
     return ret;
 
-  if (ignore_error)
-    cogl_error_free (ignore_error);
+  cogl_error_free (ignore_error);
 
   /* If the map fails then we'll use a temporary buffer to fill
      the data and then upload it using cogl_buffer_set_data when