[Bf-blender-cvs] [8ae74ec] master: Fix null-pointer free

[Campbell Barton]

Commit: 8ae74ece9a38ac7e7c49e2ba61c103c395fc31ff
Author: Campbell Barton
Date:   Wed Jun 22 05:34:04 2016 +1000
Branches: master
https://developer.blender.org/rB8ae74ece9a38ac7e7c49e2ba61c103c395fc31ff

Fix null-pointer free

Own error in recent decimeter commit

===================================================================

M       source/blender/bmesh/intern/bmesh_polygon.c
M       source/blender/bmesh/tools/bmesh_decimate_collapse.c

===================================================================

diff --git a/source/blender/bmesh/intern/bmesh_polygon.c 
b/source/blender/bmesh/intern/bmesh_polygon.c
index 79051a2..fff6bea 100644
--- a/source/blender/bmesh/intern/bmesh_polygon.c
+++ b/source/blender/bmesh/intern/bmesh_polygon.c
@@ -1036,6 +1036,7 @@ void BM_face_triangulate(
         const int quad_method,
         const int ngon_method,
         const bool use_tag,
+        /* use for ngons only! */
         MemArena *pf_arena,
 
         /* use for MOD_TRIANGULATE_NGON_BEAUTY only! */
diff --git a/source/blender/bmesh/tools/bmesh_decimate_collapse.c 
b/source/blender/bmesh/tools/bmesh_decimate_collapse.c
index acb220b..b4e8bb0 100644
--- a/source/blender/bmesh/tools/bmesh_decimate_collapse.c
+++ b/source/blender/bmesh/tools/bmesh_decimate_collapse.c
@@ -603,9 +603,8 @@ static bool bm_decim_triangulate_begin(BMesh *bm, int 
*r_edges_tri_tot)
                        faces_double = next;
                }
 
-               BLI_memarena_free(pf_arena);
-
                if (has_ngon) {
+                       BLI_memarena_free(pf_arena);
                        BLI_heap_free(pf_heap, NULL);
                        BLI_edgehash_free(pf_ehash, NULL);
                }

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