[mutter] cogl: Use autopointers to free structs on return

[Robert Mader <rmader src gnome org>]

commit 645d596f9d39e26c239a307fa699f11eeb921e18
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Tue Jul 9 11:13:09 2019 +0200

    cogl: Use autopointers to free structs on return
    
    This is a potential leak discovered by static analysis, in fact if
    _COGL_GET_CONTEXT returns, the newly allocated struct isn't released.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/1195

 cogl/cogl-pango/cogl-pango-fontmap.c | 4 ++--
 cogl/cogl/cogl-onscreen.c            | 4 +++-
 cogl/cogl/cogl-pipeline-cache.c      | 4 ++--
 3 files changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/cogl/cogl-pango/cogl-pango-fontmap.c b/cogl/cogl-pango/cogl-pango-fontmap.c
index 0c43909c7..714ba6546 100644
--- a/cogl/cogl-pango/cogl-pango-fontmap.c
+++ b/cogl/cogl-pango/cogl-pango-fontmap.c
@@ -74,7 +74,7 @@ PangoFontMap *
 cogl_pango_font_map_new (void)
 {
   PangoFontMap *fm = pango_cairo_font_map_new ();
-  CoglPangoFontMapPriv *priv = g_new0 (CoglPangoFontMapPriv, 1);
+  g_autofree CoglPangoFontMapPriv *priv = g_new0 (CoglPangoFontMapPriv, 1);
 
   _COGL_GET_CONTEXT (context, NULL);
 
@@ -85,7 +85,7 @@ cogl_pango_font_map_new (void)
    * for now. */
   g_object_set_qdata_full (G_OBJECT (fm),
                            cogl_pango_font_map_get_priv_key (),
-                           priv,
+                           g_steal_pointer (&priv),
                            free_priv);
 
   return fm;
diff --git a/cogl/cogl/cogl-onscreen.c b/cogl/cogl/cogl-onscreen.c
index 1bd1d5911..704e1c44b 100644
--- a/cogl/cogl/cogl-onscreen.c
+++ b/cogl/cogl/cogl-onscreen.c
@@ -93,10 +93,12 @@ _cogl_onscreen_init_from_template (CoglOnscreen *onscreen,
 CoglOnscreen *
 _cogl_onscreen_new (void)
 {
-  CoglOnscreen *onscreen = g_new0 (CoglOnscreen, 1);
+  g_autofree CoglOnscreen *onscreen_ptr = g_new0 (CoglOnscreen, 1);
+  CoglOnscreen *onscreen;
 
   _COGL_GET_CONTEXT (ctx, NULL);
 
+  onscreen = g_steal_pointer (&onscreen_ptr);
   _cogl_framebuffer_init (COGL_FRAMEBUFFER (onscreen),
                           ctx,
                           COGL_FRAMEBUFFER_TYPE_ONSCREEN,
diff --git a/cogl/cogl/cogl-pipeline-cache.c b/cogl/cogl/cogl-pipeline-cache.c
index 216add80f..6bfc37732 100644
--- a/cogl/cogl/cogl-pipeline-cache.c
+++ b/cogl/cogl/cogl-pipeline-cache.c
@@ -50,7 +50,7 @@ struct _CoglPipelineCache
 CoglPipelineCache *
 _cogl_pipeline_cache_new (void)
 {
-  CoglPipelineCache *cache = g_new (CoglPipelineCache, 1);
+  g_autofree CoglPipelineCache *cache = g_new (CoglPipelineCache, 1);
   unsigned long vertex_state;
   unsigned long layer_vertex_state;
   unsigned int fragment_state;
@@ -80,7 +80,7 @@ _cogl_pipeline_cache_new (void)
                                   layer_vertex_state | layer_fragment_state,
                                   "programs");
 
-  return cache;
+  return g_steal_pointer (&cache);
 }
 
 void