fix for crash on load if the file was saved in editmesh,
BKE_mesh_uv_cdlayer_rename_index was checking editmesh pointer before it was NULL'd by direct_link_mesh.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@60596 954f8c5b-7b00-dc11-b283-0030488c597c