Fix crash at exit time in appleseed.cli in benchmark mode
Fix crash at exit time in appleseed.cli in benchmark mode

gospodnetic/appleseed,appleseedhq/appleseed,aytekaman/appleseed,glebmish/appleseed,dictoon/appleseed,luisbarrancos/appleseed,Biart95/appleseed,appleseedhq/appleseed,Vertexwahn/appleseed,aiivashchenko/appleseed,aiivashchenko/appleseed,est77/appleseed,pjessesco/appleseed,pjessesco/appleseed,gospodnetic/appleseed,Vertexwahn/appleseed,Vertexwahn/appleseed,Vertexwahn/appleseed,Aakash1312/appleseed,pjessesco/appleseed,dictoon/appleseed,Aakash1312/appleseed,Biart95/appleseed,Vertexwahn/appleseed,Aakash1312/appleseed,Biart95/appleseed,aytekaman/appleseed,luisbarrancos/appleseed,aytekaman/appleseed,dictoon/appleseed,dictoon/appleseed,aiivashchenko/appleseed,est77/appleseed,glebmish/appleseed,appleseedhq/appleseed,glebmish/appleseed,aiivashchenko/appleseed,luisbarrancos/appleseed,est77/appleseed,gospodnetic/appleseed,luisbarrancos/appleseed,glebmish/appleseed,Biart95/appleseed,glebmish/appleseed,Biart95/appleseed,gospodnetic/appleseed,aiivashchenko/appleseed,pjessesco/appleseed,appleseedhq/appleseed,dictoon/appleseed,pjessesco/appleseed,est77/appleseed,luisbarrancos/appleseed,aytekaman/appleseed,Aakash1312/appleseed,est77/appleseed,aytekaman/appleseed,gospodnetic/appleseed,Aakash1312/appleseed,appleseedhq/appleseed