Close buffer via <C-@> using CtrlP

ctrlp.vim

let g:ctrlp_buffer_func = { 'enter': 'CtrlPMappings' }

function! CtrlPMappings()
  nnoremap <buffer> <silent> <C-@> :call <sid>DeleteBuffer()<cr>
endfunction

function! s:DeleteBuffer()
  let path = fnamemodify(getline('.')[2:], ':p')
  let bufn = matchstr(path, '\v\d+\ze\*No Name')
  exec "bd" bufn ==# "" ? path : bufn
  exec "norm \<F5>"
endfunction

Seems like this approach doesn't work when the filename is long and CtrlP replaces part of its name by "..." Any ideas how to modify the script to handle this case as well?