OBJ importer: do not do 'smart' init of new UV layers.

Not really important here (we expect to set a value for all items), but
avoids useless computation anyway.

io_scene_obj/__init__.py

@@ -21,7 +21,7 @@
 bl_info = {
     "name": "Wavefront OBJ format",
     "author": "Campbell Barton, Bastien Montagne",
-    "version": (3, 5, 9),
+    "version": (3, 5, 6),
     "blender": (2, 80, 0),
     "location": "File > Import-Export",
     "description": "Import-Export OBJ, Import OBJ mesh, UV's, materials and textures",

io_scene_obj/import_obj.py

@@ -676,7 +676,7 @@ def create_mesh(new_objects,
         me.loops.foreach_set("normal", loops_nor)
 
     if verts_tex and me.polygons:
-        me.uv_layers.new()
+        me.uv_layers.new(do_init=False)
         loops_uv = tuple(uv for (_, _, face_vert_tex_indices, _, _, _, _) in faces for face_uvidx in face_vert_tex_indices for uv in verts_tex[face_uvidx])
         me.uv_layers[0].data.foreach_set("uv", loops_uv)