LuajitError: builtin/fio.lua:544: pathname is absent

[racherb]

Describe the bug
File watcher fails when passing the file sort parameters for date 'MA' or 'MD' with the following error message:
main/119/file-watcher-bulk-d utils.c:1014 E> LuajitError: builtin/fio.lua:544: pathname is absent

To Reproduce
Steps to reproduce the behavior:

1. Execute the following shell script:

#!/usr/bin/env tarantool

local file_watcher=require('watcher').file
local fiber=require('fiber')

local function remove_file(file, waitfor)
    fiber.sleep(waitfor)
    os.remove(file)
end

os.execute('touch /tmp/f_G.txt')
os.execute('touch /tmp/f_H.txt')
os.execute('touch /tmp/f_I.txt')
os.execute('touch /tmp/f_J.txt')
os.execute('touch /tmp/f_K.txt')
os.execute('touch /tmp/f_L.txt')

local n_match = 2

fiber.create(remove_file, '/tmp/f_G.txt', 2)
fiber.create(remove_file, '/tmp/f_L.txt', 2)
fiber.create(remove_file, '/tmp/f_K.txt', 2)

local ini = os.time()

local SORT_BY = {
    NO_SORT = 'NS',
    ALPHA_ASC = 'AA',
    ALPHA_DSC = 'AD',
    MTIME_ASC = 'MA',
    MTIME_DSC = 'MD'
}

local sort_by = SORT_BY.MTIME_ASC

--This fail for SORT_BY.MTIME_ASC and SORT_BY.MTIME_DSC
res = file_watcher.deletion({'/tmp/f_*'}, 5, 0.5, {'MA', 3, 2})

print('Elapsed time: ' .. os.difftime(os.time() - ini) .. 's')

print(res.wid)
print(res.ans)

os.exit()

2. See error

Expected behavior
The system should work equally well for the different types of file sorting: NO_SORT = 'NS', ALPHA_ASC = 'AA', ALPHA_DSC = 'AD', MTIME_ASC = 'MA' and MTIME_DSC = 'MD'.

[github-actions]

Message that will be displayed on users' first issue

[racherb]

Solution applied in commit db8b5e8e8e2d74341fcd07cbfb44f103cb092786d6